Open Access

Schizophrenia trials conducted in African countries: a drop of evidence in the ocean of morbidity?

International Journal of Mental Health Systems20126:9

DOI: 10.1186/1752-4458-6-9

Received: 15 May 2012

Accepted: 7 June 2012

Published: 6 July 2012

Abstract

Objective

To quantify schizophrenia trialling activity in African countries and to describe the main features of these trials.

Methods

We searched the Cochrane Schizophrenia Group Register, which contains 16,000 citations to 13,000 studies relating only to people with schizophrenia or schizophrenia-like illness, to identify schizophrenia trials conducted in Africa without time limitation.

Results

A total of 38 trials met the inclusion criteria and were included in our analysis. Of the 54 countries of Africa, only 8 produced at least one trial: South Africa produced the majority of trials (20 out of 38 trials, 53%), followed by Nigeria (7 out of 38 trials, 18%) and Egypt (4 out of 38 trials, 11%). The majority of studies investigated the efficacy of pharmacological interventions, were short in duration, and employed a double-blind design. The quality of reporting was generally poor. We found six trials comparing antipsychotics from the WHO Essential List of Medicine versus new generation antipsychotics. In terms of efficacy and acceptability, these studies failed to show any advantage of newer antipsychotics over first-generation agents.

Conclusions

We observed an impressive mismatch between the number of individuals with schizophrenia living in African countries, estimated to be around 10 million, and the overall number of patients included in African trials, which is less than 2,000. These few trials were of low quality and appeared not to reflect the real needs of the population. We argue that the concept of pragmatism should be introduced into the design of randomized trials in African countries. Pragmatic trials should investigate whether treatments, given in real-world circumstances, really have clinically meaningful effects.

Keywords

Clinical trials Africa Schizophrenia

Introduction

Most of the global burden of mental illness falls to the poorest nations, where 80% of world’s population live [1]. Africa is the second-most-populated continent, with around 1 billion people, or 15% of the world's population. For schizophrenia, a major psychiatric disorder that affects about 0.5% of world population [2], it has been estimated that between 4 and 5 million individuals afflicted by these severe psychiatric disorders live in African countries [2]. Despite these impressive numbers, the worldwide deficit of research about psychiatric disorders is particularly acute in low- and middle-income countries (LAMICs), including several African countries [3]. LAMICs devote less than 1% of their health expenditure to mental health and have poorly developed mental health policies and research infrastructures [4].

For patients, carers and policymakers local data are important. Even well-conducted trials, if undertaken in a very dissimilar care-culture may be difficult to apply. Local trials are important and informative whether they agree or disagree other similar studies from afar. All evidence must be considered but the local perspective not ignored. The quality of any trialling activity is another crucial issue, as it may vary across nations [5, 6]. For example, the volume and quality of trial research from China has been considered in many surveys and quality remains a major concern [711]. Elsewhere it has been shown that pioneering mental health trials from LAMICs are of as mixed quality as their more accessible counterparts from richer nations, but cannot be identified in commonly used bibliographic databases [12].

The Cochrane Schizophrenia Group produces and maintains a register of all studies [13]. This involves regular and systematic searching of 71 databases worldwide. The studies identified in this way are reliably indexed by country.

The aim of this work is to quantify schizophrenia trialling activity in African countries and to provide detailed information on the main clinical and methodological features of these trials. Our analysis could be used by researchers and policy makers to help plan future research to cover the mental health needs of African population.

Methods

Search methods for identification of studies

We searched the Cochrane Schizophrenia Group Register to identify any trial conducted in Africa without time limitation. The Cochrane Schizophrenia Group Register contains 16,000 citations to 13,000 studies relating only to people with schizophrenia or schizophrenia-like illness [13]. The register includes all published and unpublished references to randomized, quasi randomized and controlled clinical trials without language restrictions. These studies are indexed regarding the country of origin, the interventions under study and the number of participants. The last version of register was February 2012.

Types of studies

We included all randomised controlled trials and controlled clinical trials undertaken in any African country. Included studies compared any pharmacological and non-pharmacological treatments with other active treatments or placebo. Only studies that enrolled patients in Africa were considered. Multicentre studies were included only if all centres enrolling patients were located in Africa.

Types of participants

Participants were in- and out-patients of both sexes, with a primary diagnosis of schizophrenia and related psychotic disorders, according to the criteria described in the DSM, ICD, or according to any other clinical or standardized criteria.

Selection of trials

Included and excluded studies were collected following the Preferred Reporting Items for Systematic reviews and Meta-Analyses – PRISMA flow diagram [14]. From the Cochrane Schizophrenia Group Register we extracted all records corresponding to studies carried out in Africa. We examined all titles and abstracts, and obtained full texts if the word “random” or “randomised” or “control” or “controlled” was present in the title and/or abstract. MP and CB read the full texts, determined whether they met inclusion criteria and extracted the data. Considerable care was taken to exclude duplicate publications.

Assessment of risk of bias in included studies

For quality assessment we used the Cochrane risk-of-bias tool (Oxford, England, Cochrane Collaboration). This instrument consists of seven items [15]. Two of the items assess the strength of the randomization process in preventing selection bias in the assignment of participants to interventions: adequacy of sequence generation and allocation concealment. The third and fourth items assess the influence of performance bias and detection bias on the study results. The fifth item assesses the likelihood of incomplete outcome data, which raise the possibility of bias in effect estimates. The sixth item assesses selective reporting, the tendency to preferentially report statistically significant outcomes. This item requires a comparison of published data with trial protocols, when such are available. The final item refers to other sources of bias that are relevant in certain circumstances, such as, for example, sponsorship bias.

Data extraction

The following information was extracted using an electronic spreadsheet: year of publication, geographic area (country of Africa), type of experimental and control intervention, sample size, weeks of follow-up, diagnostic criteria, number of outcome measures, Gross Domestic Product (GDP) at the time when each study was carried out. For studies that compared antipsychotics included in the WHO Essential List of Medicines [16] with new generation antipsychotics we additionally extracted efficacy and acceptability data. For efficacy data, the mean change from baseline to endpoint, or the mean scores at endpoint, at the Brief Psychiatric Rating Scale (BPRS) or Positive and Negative Syndrome Scale (PANSS) were extracted, together with the standard deviation (SD) or standard error (SE) of these values, and the number of patients included in these analyses. For acceptability data, the number of patients leaving the study early for any reason was extracted.

Data presentation

We calculated simple percentages (%). To ascertain whether sample size and number of efficacy measures have increased in the last 40 years, we used a box plot diagram and a nonparametric test for trend (extension of the Wilcoxon rank-sum test). For each study that compared antipsychotics included in the WHO Essential List of Medicines with new generation antipsychotics, efficacy and acceptability data were entered and analyzed using the Cochrane Collaboration’s Review Manager software version 5.1 (Oxford, England, Cochrane Collaboration). Continuous data were analyzed using standardized mean differences (SMDs) with the random-effects-model (with 95% confidence intervals [CI]); for dichotomous outcomes, the odds ratio (OR) was calculated based on the random effects model (with 95% CI). This approach was used to present the results of individual studies, but no overall treatment estimates were calculated.

Results

Characteristics of included studies

The original search yielded 69 records, of which 27 were excluded because ineligible or not relevant. The remaining 42 records were assessed for eligibility. Thirty-eight trials met the inclusion criteria and were included in our analysis (Figure1) (for references of included studies, see reference list from [1754]).
Figure 1

PRISMA Flow diagram.

Eight out of the 54 countries of Africa produced at least one trial (Figure2). South Africa produced the majority of trials (20 out of 38 trials, 53%), followed by Nigeria (7 out of 38 trials, 18%) and Egypt (4 out of 38 trials, 11%). These countries had the highest Gross Domestic Product compared with the other countries producing trials in Africa (Figure2). The characteristics of all included studies are presented in Table1. The majority of studies investigated pharmacological interventions, with a drug versus drug design in most cases (33 out of 38 trials, 87%). Most studies were short in duration (22 out of 38 had a follow-up ≤ 12 weeks, 58%), had a double-blind design and used standardized diagnostic criteria (DSM or ICD). Local ethics committee approval has been mentioned in 22 out of 38 studies. Fifteen studies were funded by pharmaceutical industries, three studies were independent from drug industry and in remaining 20 studies the role of sponsorship was unclear (Table1).
Figure 2

Distribution of schizophrenia trials by African country and Gross Domestic Product.

Table 1

Characteristics of schizophrenia trials conducted in Africa

 

STUDIES (n = 38) No %

Type of comparison

Typical AP versus typical AP

12 (31.58)

Typical AP versus placebo

3 (7.89)

Typical AP versus no treatment

1 (2.63)

Typical AP versus atypical AP

6 (15.79)

Atypical AP versus atypical AP

4 (10.53)

Other pharmacological interventions

7 (18.42)

Non pharmacological interventions

5 (13.16)

Year of publication

1970–1985

9 (23.68)

1986–2000

9 (23.68)

2001–2010

20 (52.64)

Sample size

Min-20

4 (10.81)

21–40

12 (32.43)

41–60

10 (27.03)

61-Max

11 (29.73)

Arms

Two arms

34 (89.47)

Three arms or more

4 (10.53)

Weeks of follow-up

< 6 weeks

16 (42.43)

6–12 weeks

9 (24.24)

13–24 weeks

7 (18.18)

> 24 weeks

6 (15.15)

Blinding

Open label

6 (15.79)

Single blind

7 (18.42)

Double blind

18 (47.37)

Unclear

7 (18.42)

Diagnostic criteria

Unclear

9 (23.68)

DSM† − ICD††

25 (65.79)

Clinical diagnosis

4 (10.53)

Number of outcomes

Min-5

13 (34.21)

6–10

14 (36.84)

11-Max

11 (28.95)

Ethics committee approval

Unclear

16 (42.11)

Yes

22 (57.89)

Sponsor (drug company)

Unclear

20 (52.63)

Yes

15 (39.48)

Independent study

3 (7.89)

While sample size only minimally increased over time (Figure3), as shown by Spearman's rank correlation coefficient (rho = 0.333; p = 0.043), the number of outcomes measures significantly increased over time (rho = 0.357; p < 0.027).
Figure 3

Distribution of schizophrenia trials carried out in Africa by sample size (a) and number of outcome measures (b) from 1970 to 2010. The horizontal line represents the median, the box extends to cover the interquartile range and the vertical line extends to the extremes.

Risk of bias

The standard of reporting was generally poor (Figure4) (For study by study risk of bias, see Additional file 1). The generation of the randomization sequence and the concealment of allocation were not properly described in the majority of studies. Blinding was adopted in some studies, but not accurately described. The risk of other bias, such as sponsorship bias, could not be excluded, as several studies received financial support from pharmaceutical industries.
Figure 4

Methodological quality graph: review authors' judgements about each methodological quality item presented as percentages across all included studies.

Essential antipsychotics versus new generation antipsychotics

Six trials compared antipsychotics from the WHO essential list of medicine versus new generation antipsychotics. Essential antipsychotics were haloperidol and chlorpromazine; new generation antipsychotics were quetiapine, olanzapine and risperidone. Efficacy and acceptability data, available for 5 studies only, are presented in Figures 5 and 6, respectively. In terms of efficacy, three studies comparing haloperidol versus new generation antipsychotics failed to show any difference. Studies comparing chlorpromazine versus olanzapine provided contrasting evidence. In one study chlorpromazine was less effective than olanzapine (SMD = 1.55, 95% CI 0.78 to 2.32 n = 39), in the other one chlorpromazine was slightly more effective than olanzapine (SMD −0.58, 95% CI −1.24 to 0.08 n = 41) (Figure5). In terms of acceptability, studies failed to show any difference (Figure5).
Figure 5

Efficacy data of schizophrenia trials conducted in Africa comparing antipsychotics included in the WHO List of Essential Medicines (haloperidol and chlorpromazine) with new generation antipsychotics.

Figure 6

Acceptability data (total dropout rates) of schizophrenia trials conducted in Africa comparing antipsychotics included in the WHO List of Essential Medicines (haloperidol and chlorpromazine) with new generation antipsychotics.

Discussion

To our knowledge, this is the first survey investigating content and quality of schizophrenia trials carried out in African countries. A first impressive result is the mismatch between the number of individuals with schizophrenia living in African countries, estimated to be around 5 million [2], and the overall number of patients included in African trials, which is less than 2,000 (accounting for 0.001% of patients included in the totality of trials conducted in schizophrenia at a global level according to the Cochrane Schizophrenia Register) (http://szg.cochrane.org/cochrane-schizophrenia-group-specialised-register). The mismatch is even more striking if one considers that 15% of the world population lives in Africa, but only 0.005% of the world schizophrenia trials have been conducted in the continent (Figure7). As one might expect, the great majority of trials on schizophrenia are conducted in high-income countries (32% in North America and 26% in Europe), but emergent countries like China, Brazil or India –with a middle-low or low Gross Domestic Product- are having a recent burgeoning of work [6]. For example, even if Chinese trials are often described as poor in methodological quality [9, 55], China produced in the last decade a great amount of randomized trials (22% of all schizophrenia trials coded in the Cochrane Schizophrenia Group Register come from China) [6]. Also from Brazil and India there are examples of emergent high quality research activity [56].
Figure 7

Pyramid describing the mismatch between the number of individuals with schizophrenia living in African countries and the number of trials conducted, and patients involved, in African countries.

A second issue is that these few trials appear not to reflect the real needs of the population. The World Mental Health surveys showed that more than 75% of those identified with serious mental disorders in LAMICs received no care at all, despite substantial role disability [57]. In sub-Saharan Africa, the treatment gap for schizophrenia and other psychoses has been shown to exceed 90%. Additionally, even where treatment is provided, it often is far below minimum acceptable standards. In such a situation it seems difficult to believe that trials addressing the efficacy of antipsychotic drugs versus placebo, or trials aiming to ascertain the added value of new generation antipsychotics over inexpensive “essential” antipsychotics can be seen as a priority. If one additionally considers that most trials were underpowered, failed to report basic methodological details such as, for example, information about the methods of random allocation, and its concealment from the study investigators, or how blinding was preserved, than the overall situation seems even more desolating, as the practical contribution of these studies to African patients, carers and policymakers is at least questionable. Unfortunately, trial quality has not substantially increased over time: while sample size increased only minimally over time, patient selection criteria and outcome assessments have become much more sophisticated, as suggested by the increase in use of standardized diagnostic criteria and by the steadily increase in the number of outcome measures. Although this trend may have increased the internal validity of findings, it has nevertheless allowed study of only highly refined groups of people with schizophrenia. This increasing drift from real world practice makes it difficult to apply trial results to typical patients [58]. Similarly, we observed that the number of outcome measures has increased during the last 40 years. This confusion of measuring suggests, at the very least, a lack of consensus on what is important.

Instead of increasing the drift from real world practice, randomized trials should be able to enroll real-world patients populations to be followed under real-world circumstances and assessed with outcome measures that are used in practice. As has already been happening in many other countries of the world, the concept of pragmatism should be introduced into the design of randomized trials in African countries. Pragmatic trials should investigate whether treatments, given in real-world circumstances, really have clinically meaningful effects. An example of this attitude is the series of TREC studies carried out in Brazil and India which randomized treatments given in day to day practice, left all subsequent decisions to clinicians, and used routine data as primary outcomes [5962]. The concept of pragmatism could be similarly applied to the purpose of clinical trials, with a strong focus and commitment to answering questions of high public health relevance. Examples of trials undertaken with this logic are available, for example in the area of interventions for psychosocial wellbeing in humanitarian settings [63]. Another pragmatic area of interest is implementation science [64], with a focus on investigating the most effective interaction between specialist and non-specialist care providers, such as the extent to which tasks can be shifted and the duration, type, and frequency of training and supervision that are required. WHO has recently produced an evidence-based intervention package with recommendations to facilitate care at first and second level facilities by the non-specialist health care providers in low and middle income countries [65, 66], but no randomized evidence exists on how this package should be implemented to maximize benefit at sustainable costs. Researchers and funders have tremendous responsibility in this context. Consortia and networks, advocacy organizations, universities and their partners should organize their activities considering that the implementation of a new generation of randomized trials in African countries is a pressing priority [64].

The present analysis has limitations. First, we did not include international multicentre studies where African countries were single sites, possibly loosing studies with good sample sizes and potentially better reporting. Second, despite the extensive searches, the possibility that some relevant studies have not been identified cannot be ruled out. The Cochrane Schizophrenia Group maintains a trial register by regularly and systematically searching 71 databases worldwide. However, it is possible that some journals are not indexed in these databases, and there might be some other local databases that are not included in our searches. Other factors are that some databases have become available only recently, and poor indexing within some databases may have impaired retrieval. We argue that accessibility to trials conducted in African countries should be improved by prospective registration of all future trials, as endorsed by the International Committee of Medical Journal Editors (ICMJE) [67] and the World Health Organization's International Clinical Trials Registry Platform [68].

In conclusion, this study generates information on the clinical and methodological characteristics of trials conducted in Africa on schizophrenia interventions. This information is needed to plan and implement future schizophrenia clinical trials, to suggest research areas that may have not received adequate attention, and to point to methodological aspects that need to be addressed when planning future trialling activities.

Declarations

Acknowledgements

Authors would like to thank Samantha Roberts for providing updated searches from the Cochrane Schizophrenia Group Register.

Authors’ Affiliations

(1)
Division of Psychiatry, University of Nottingham,
(2)
Department of Public Health and Community Medicine, Section of Psychiatry, University of Verona

References

  1. Scaling up care for mental, neurological, and substance use disorders; http://www.who.int/mental_health/mhgap_final_english.pdf
  2. Saha S, Chant D, Welham J, McGrath J: A systematic review of the prevalence of schizophrenia. Plos Med. 2005, 2: e141-10.1371/journal.pmed.0020141.PubMed CentralView ArticlePubMedGoogle Scholar
  3. Large M, Nielssen O, Farooq S, Glozier N: Increasing rates of psychiatric publication from low- and middle-income countries. Int J Soc Psychiatry. 2010, 56: 497-506. 10.1177/0020764009102412.View ArticlePubMedGoogle Scholar
  4. Sheriff RJ, Adams CE, Tharyan P, Jayaram M, Duley L: Randomised trials relevant to mental health conducted in low and middle-income countries: a survey. BMC Psychiatry. 2008, 8: 69-10.1186/1471-244X-8-69.PubMed CentralView ArticlePubMedGoogle Scholar
  5. Thornley B, Adams C: Content and quality of 2000 controlled trials in schizophrenia over 50 years. BMJ. 1998, 317: 1181-1184. 10.1136/bmj.317.7167.1181.PubMed CentralView ArticlePubMedGoogle Scholar
  6. Miyar J, Adams CE: Content and Quality of 10 000 Controlled Trials in Schizophrenia Over 60 Years. Schizophr Bull. 2012, Jan 30. [Epub ahead of print]Google Scholar
  7. Chakrabarti A, Adams CE, Rathbone J, Wright J, Xia J, Wong W, Von RP, Koenig C, Baier S, Pfeiffer C et al; Schizophrenia trials in China et al; a survey. Acta Psychiatr Scand. 2007, 116: 6-9.View ArticlePubMedGoogle Scholar
  8. Xia J, Wright J, Adams CE: Five large Chinese biomedical bibliographic databases: accessibility and coverage. Health Info Libr J. 2008, 25: 55-61. 10.1111/j.1471-1842.2007.00734.x.View ArticlePubMedGoogle Scholar
  9. Zhang D, Yin P, Freemantle N, Jordan R, Zhong N, Cheng KK: An assessment of the quality of randomised controlled trials conducted in China. Trials. 2008, 9: 22-10.1186/1745-6215-9-22.PubMed CentralView ArticlePubMedGoogle Scholar
  10. Chen Y, Li J, Ai C, Duan Y, Wang L, Zhang M, Hopewell S: Assessment of the quality of reporting in abstracts of randomized controlled trials published in five leading Chinese medical journals. PLoS One. 2010, 5: e11926-10.1371/journal.pone.0011926.PubMed CentralView ArticlePubMedGoogle Scholar
  11. Koesters M, Zhang Y, Chun Y, Weinmann S, Becker T, Jin WD: What can we learn from chinese randomized controlled trials? A systematic review and meta-analysis of chinese venlafaxine studies. J Clin Psychopharmacol. 2011, 31: 194-200. 10.1097/JCP.0b013e31820f932a.View ArticlePubMedGoogle Scholar
  12. Adams CE, Tharyan P, Coutinho ES, Stroup TS: The schizophrenia drug-treatment paradox: pharmacological treatment based on best possible evidence may be hardest to practise in high-income countries. Br J Psychiatry. 2006, 189: 391-392. 10.1192/bjp.bp.106.029983.View ArticlePubMedGoogle Scholar
  13. Cochrane Schizophrenia Group Specialised Register; http://szg.cochrane.org/cochrane-schizophrenia-group-specialised-register
  14. Moher D, Liberati A, Tetzlaff J, Altman DG: Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. BMJ. 2009, 339: b2535-10.1136/bmj.b2535.PubMed CentralView ArticlePubMedGoogle Scholar
  15. Cochrane Handbook for systematic reviews of interventions. Version 5.1.0. The Cochrane CollaborationGoogle Scholar
  16. WHO Model Lists of Essential Medicines; http://www.who.int/medicines/publications/essentialmedicines/en/
  17. Agara AJ, Onibi OE: Effects of group psychoeducation (GPE) on compliance with scheduled clinic appointments in a neuro-psychiatric hospital in southwest Nigeria: a randomised control trial (RCT). Ann Acad Med Singapore. 2007, 36: 272-275.PubMedGoogle Scholar
  18. Anumonye A, Onibuwe-Johnson T, Marinho AA: Clinical trial of pimozide. West Afr J Pharmacol Drug Res. 1976, 3: 17-24.PubMedGoogle Scholar
  19. Askar AM, Rakhawy YT, El-Guindy T: Thioridazine in treatment of psychiatric patients. J Egypt Med Assoc. 1963, 46: 918-932.PubMedGoogle Scholar
  20. Berk M, Brook S, Trandafir AI: A comparison of olanzapine with haloperidol in cannabis-induced psychotic disorder: a double-blind randomized controlled trial. Int Clin Psychopharmacol. 1999, 14: 177-180.PubMedGoogle Scholar
  21. Berk M, Ichim C, Brook S: Efficacy of mirtazapine add on therapy to haloperidol in the treatment of the negative symptoms of schizophrenia: a double-blind randomized placebo-controlled study. Int Clin Psychopharmacol. 2001, 16: 87-92. 10.1097/00004850-200103000-00003.View ArticlePubMedGoogle Scholar
  22. Berk M, Brook S, Nur F: Risperidone compared to haloperidol in cannabis-induced psychotic disorder: A double blind randomized controlled trial. Int J Psychiatry in Clin Pract. 2000, 4: 139-142.View ArticleGoogle Scholar
  23. Botha UA, Koen L, Joska JA, Hering LM, Oosthuizen PP: Assessing the efficacy of a modified assertive community-based treatment programme in a developing country. BMC Psychiatry. 2010, 10: 73-10.1186/1471-244X-10-73.PubMed CentralView ArticlePubMedGoogle Scholar
  24. Brook S, Berk M, Selemani S, Kolloori J, Nzo I: A randomized controlled double blind study of zuclopenthixol acetate compared to haloperidol in acute psychosis. Hum Psychopharmacol. 1998, 13: 17-20. 10.1002/(SICI)1099-1077(199801)13:1<17::AID-HUP937>3.0.CO;2-G.View ArticleGoogle Scholar
  25. Desta M, Tadesse A, Gebre N, Barci BM, Torrey EF, Knable MB: Controlled trial of hydroxychloroquine in schizophrenia. J Clin Psychopharmacol. 2002, 22: 507-510. 10.1097/00004714-200210000-00011.View ArticlePubMedGoogle Scholar
  26. El-Islam MF, Ahmed SA, Erfan ME: The effect of unilateral E.C.T. on schizophrenic delusions and hallucinations. Br J Psychiatry. 1970, 117: 447-448. 10.1192/bjp.117.539.447.View ArticlePubMedGoogle Scholar
  27. Emsley R, Turner HJ, Schronen J, Botha K, Smit R, Oosthuizen PP: Effects of quetiapine and haloperidol on body mass index and glycaemic control: a long-term, randomized, controlled trial. Int J Neuropsychopharmacol. 2005, 8: 175-182. 10.1017/S1461145705005067.View ArticlePubMedGoogle Scholar
  28. Emsley R, Myburgh C, Oosthuizen P, van Rensburg SJ: Randomized, placebo-controlled study of ethyl-eicosapentaenoic acid as supplemental treatment in schizophrenia. Am J Psychiatry. 2002, 159: 1596-1598. 10.1176/appi.ajp.159.9.1596.View ArticlePubMedGoogle Scholar
  29. Emsley R, Niehaus DJ, Oosthuizen PP, Koen L, Ascott-Evans B, Chiliza B, van Rensburg SJ, Smit RM: Safety of the omega-3 fatty acid, eicosapentaenoic acid (EPA) in psychiatric patients: results from a randomized, placebo-controlled trial. Psychiatry Res. 2008, 161: 284-291. 10.1016/j.psychres.2007.06.029.View ArticlePubMedGoogle Scholar
  30. Erinfolami A, Ola B, Olagunju A: Impact of atypical and conventional antipsychotics on the quality of life of patients with schizophrenia: a preliminary report from Lagos teaching hospitals. World Psychiatry. 2009, 8 (suppl1): -Google Scholar
  31. Fawzi M, Fawzi M: Aripiprazole, olanzapine and olanzapine-clomipramine combination in schizophrenia with obsessive-compulsive symptoms. World Psychiatry. 2009, 8 (suppl1): -Google Scholar
  32. Golden G, Honigfeld G: Bioequivalence of clozapine orally disintegrating 100-mg tablets compared with clozapine solid oral 100-mg tablets after multiple doses in patients with schizophrenia. Clin Drug Investig. 2008, 28: 231-239. 10.2165/00044011-200828040-00004.View ArticlePubMedGoogle Scholar
  33. Loza N, El-Dosoky AM, Okasha TA, Khalil AH, Hasan NM, Dossenbach M, Kratky P, Okasha A: Olanzapine compared to chlorpromazine in acute schizophrenia. Eur Neuropsychopharmacol. 1999, 9: S291-View ArticleGoogle Scholar
  34. Makanjuola RO, Dixon PA, Oforah E: Effects of antimalarial agents on plasma levels of chlorpromazine and its metabolites in schizophrenic patients. Trop Geogr Med. 1988, 40: 31-33.PubMedGoogle Scholar
  35. Martyns-Yellowe IS: The decanoates of flupenthixol and clopenthixol in the treatment of chronic schizophrenic in-patients. Implications for community psychiatry. West Afr J Med. 1993, 12: 110-113.PubMedGoogle Scholar
  36. Mechri A, Fendri C, Ben Othman L, Mekhinini A, Kerkeni A, Gaha L: Effect of first generation antipsychotic treatment on oxidative stress markers in schizophrenia. Eur Neuropsychopharmacol. 2006, 16: S438-View ArticleGoogle Scholar
  37. Neppe VM: Carbamazepine as adjunctive treatment in nonepileptic chronic in-patients with EEG temporal lobe abnormalities. J Clin Psychiatry. 1983, 44: 326-331.PubMedGoogle Scholar
  38. Odejide OA, Aderounmu AF: Double-blind placebo substitution: withdrawal of fluphenazine decanoate in schizophrenic patients. J Clin Psychiatry. 1982, 43: 195-196.PubMedGoogle Scholar
  39. Oosthuizen P, Emsley R, Jadri Turner H, Keyter N: A randomized, controlled comparison of the efficacy and tolerability of low and high doses of haloperidol in the treatment of first-episode psychosis. Int J Neuropsychopharmacol. 2004, 7: 125-131. 10.1017/S1461145704004262.View ArticlePubMedGoogle Scholar
  40. Rompel H, Segal H: A comparison of the relative efficacy of Serenace and chlorpromazine in the treatment of chronic schizophrenics. J Int Med Res. 1978, 6: 126-132.View ArticlePubMedGoogle Scholar
  41. Sefasi A, Crumlish N, Samalani P, Kinsella A, O'Callaghan E, Chilale H: A little knowledge: caregiver burden in schizophrenia in Malawi. Soc Psychiatry Psychiatr Epidemiol. 2008, 43: 160-164. 10.1007/s00127-007-0276-y.View ArticlePubMedGoogle Scholar
  42. Shibre T, Alem A, Abdulahi A, Araya M, Beyero T, Medhin G, Deyassa N, Negash A, Nigatu A, Kebede D, Fekadu A: Trimethoprim as adjuvant treatment in schizophrenia: a double-blind, randomized, placebo-controlled clinical trial. Schizophr Bull. 2010, 36: 846-851. 10.1093/schbul/sbn191.PubMed CentralView ArticlePubMedGoogle Scholar
  43. Subramaney U, Brook S, Berk M: A prospective randomised double blind controlled study of the efficacy of lorazepam versus clothiapine in the control of acutely behaviourally disturbed patients. S Afr Med J. 1998, 88: 307-310.Google Scholar
  44. Ukpong DI, Makanjuola RO, Morakinyo O: A controlled trial of modified electroconvulsive therapy in schizophrenia in a Nigerian teaching hospital. West Afr J Med. 2002, 21: 237-240.PubMedGoogle Scholar
  45. Van Wyk AJ, Marais GF: Chlorpromazine, clotiapine and thioridazine–a comparative clinical trial on Bantu psychotic patients. S Afr Med J. 1971, 45: 945-947.PubMedGoogle Scholar
  46. Van Wyk AJ, Grové JJ: Pimozide: an effective, once daily oral therapy for schizophrenia. S Afr Med J. 1972, 46: 515-517.PubMedGoogle Scholar
  47. Vanelle JM, Douki S: A double-blind randomised comparative trial of amisulpride versus olanzapine for 2 months in the treatment of subjects with schizophrenia and comorbid depression. Eur Psychiatry. 2006, 21: 523-530. 10.1016/j.eurpsy.2006.09.003.View ArticlePubMedGoogle Scholar
  48. Verster GC, Joubert G, Stevens M, van der Merwe H: Generic substitution–comparing the clinical efficacy of a generic substitute for fluphenazine decanoate with the original product. S Afr Med J. 1998, 88: 260-262.PubMedGoogle Scholar
  49. Wessels WH: A comparative study of the efficacy of bilateral and unilateral electroconvulsive therapy with thioridazine in acute schizophrenia. S Afr Med J. 1972, 46: 890-892.PubMedGoogle Scholar
  50. Uys H, Berk M: A controlled trial of modified electroconvulsive therapy in schizophrenia in a Nigerian teaching hospital. Proceedings of the 20th Collegium Internationale Neuro-Psychopharmacologicum Congress. 1996, , Melbourne, AustraliaGoogle Scholar
  51. Impact of Family Psychoeducation on Psychosis: http://clinicaltrials.gov/ct2/show/NCT01172106 (Accessed, February 9, 2012)
  52. Study HGDV olanzapine (versus chlorpromazine in Morocco): Unpublished Document Internal to Eli-lilly 2001:1–512. HGDV/Moroco. Data on file. 2001, Data supplied to the Cochrane Schizophrenia Group,Google Scholar
  53. Study Investigating the Safety and Tolerability of Multiple Doses of PF-02545920 in Subjects With Schizophrenia. http://clinicaltrials.gov/ct2/show/NCT00463372 (Accessed, February 9, 2012)
  54. Study of preladenant for the treatment of neuroleptic induced akathisia (Study P05145AM1). http://clinicaltrials.gov/ct2/show/NCT00693472 (Accessed, February 9, 2012)
  55. Purgato M, Cipriani A, Barbui C: Randomized trials published in Chinese or Western journals: comparative empirical analysis. J Clin Psychopharmacol. 2012, 32: 354-361. 10.1097/JCP.0b013e3182546ef6.View ArticlePubMedGoogle Scholar
  56. TREC Collaborative Group: Rapid tranquillisation for agitated patients in emergency psychiatric rooms: a randomised trial of midazolam versus haloperidol plus promethazine. BMJ. 2003, 327: 708-713.PubMed CentralView ArticleGoogle Scholar
  57. Demyttenaere K, Bruffaerts R, Posada-Villa J, Gasquet I, Kovess V, Lepine JP, Angermeyer MC, Bernert S, Morosini P, de GG et al; Prevalence, severity, and unmet need for treatment of mental disorders in the World Health Organization World Mental Health Surveys. JAMA. 2004, 291: 2581-2590.View ArticlePubMedGoogle Scholar
  58. Tosh G, Soares-Weiser K, Adams CE: Pragmatic vs explanatory trials: the pragmascope tool to help measure differences in protocols of mental health randomized controlled trials. Dialogues Clin Neurosci. 2011, 13: 209-215.PubMed CentralPubMedGoogle Scholar
  59. Alexander J, Tharyan P, Adams C, John T, Mol C, Philip J: Rapid tranquillisation of violent or agitated patients in a psychiatric emergency setting. Pragmatic randomised trial of intramuscular lorazepam v. haloperidol plus promethazine. Br J Psychiatry. 2004, 185: 63-69. 10.1192/bjp.185.1.63.View ArticlePubMedGoogle Scholar
  60. Raveendran NS, Tharyan P, Alexander J, Adams CE: Rapid tranquillisation in psychiatric emergency settings in India: pragmatic randomised controlled trial of intramuscular olanzapine versus intramuscular haloperidol plus promethazine. BMJ. 2007, 335: 865-10.1136/bmj.39341.608519.BE.PubMed CentralView ArticlePubMedGoogle Scholar
  61. Huf G, Coutinho ES, Ferreira MA, Ferreira S, Mello F, Adams CE: TREC-SAVE: a randomised trial comparing mechanical restraints with use of seclusion for aggressive or violent seriously mentally ill people: study protocol for a randomised controlled trial. Trials. 2011, 12: 180-10.1186/1745-6215-12-180.PubMed CentralView ArticlePubMedGoogle Scholar
  62. Huf G, Coutinho ES, Adams CE, TREC-SAVE Collaborative group: Physical restraints versus seclusion room for management of people with acute aggression or agitation due to psychotic illness (TREC-SAVE): a randomised trial. Psychol Med. 2012, in pressGoogle Scholar
  63. Tol WA, Barbui C, Galappatti A, Silove D, Betancourt TS, Souza R, Golaz A, Van OM: Mental health and psychosocial support in humanitarian settings: linking practice and research. Lancet. 2011, 378: 1581-1591. 10.1016/S0140-6736(11)61094-5.PubMed CentralView ArticlePubMedGoogle Scholar
  64. Patel V, Prince M: Global mental health: a new global health field comes of age. JAMA. 2010, 303: 1976-1977. 10.1001/jama.2010.616.PubMed CentralView ArticlePubMedGoogle Scholar
  65. Dua T, Barbui C, Clark N, Fleischmann A, Poznyak V, Van OM, Yasamy MT, Yuso-Mateos JL, Birbeck GL, Drummond C: Evidence-based guidelines for mental, neurological, and substance use disorders in low- and middle-income countries et al; summary of WHO recommendations. PLoS Med. 2011, 8: e1001122-10.1371/journal.pmed.1001122.PubMed CentralView ArticlePubMedGoogle Scholar
  66. Barbui C, Dua T, van Ommeren M, Yasamy M, Fleischmann A, Clark N, Thornicroft G, Hill S, Saxena S: Challenges in Developing Evidence-Based Recommendations Using the GRADE Approach: The Case of Mental, Neurological, and Substance Use Disorders. Plos Medicine. 2010, 7: e1000322-10.1371/journal.pmed.1000322.PubMed CentralView ArticlePubMedGoogle Scholar
  67. De Angelis CD, Drazen JM, Frizelle FA, Haug C, Hoey J, Horton R, Kotzin S, Laine C, Marusic A, Overbeke AJ et al; Is this clinical trial fully registered?–A statement from the International Committee of Medical Journal Editors. N Engl J Med. 2005, 352: 2436-2438. 10.1056/NEJMe058127.View ArticlePubMedGoogle Scholar
  68. International Clinical Trials Registry Platform (ICTRP); http://www.who.int/ictrp/en/

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