Table 4 Predictors of a longer time until sustainable RTW during 12-month follow-up (results of univariable and multivariable Cox regression, N = 681)

Age

 <50 yrs

1(ref)

 ≥50 yrs

0.56

0.39–0.80

0.001*

0.57

0.39–0.82

0.002*

0.64

0.55–0.72

Gender

 Male

1(ref)

 Female

0.9

0.67–1.21

0.5

Employment status

 Temporary agency

1(ref)

 Loss of employment contract^c

 Unemployed

0.31

0.19

0.17–0.57

0.11–0.33

< 0.001*

< 0.001*

0.25

0.19

0.14–0.47

0.11–0.33

< 0.001*

< 0.001*

0.80

0.84

0.68–0.88

0.75–0.90

Psychological symptoms^d

 Mild-to-moderate

1(ref)

 Severe

0.66

0.45–0.96

0.03*

0.64

0.43–0.93

0.02*

0.61

0.52–0.70

RTW self-efficacy^e

 High

1(ref)

 Low

0.94

0.63–1.39

0.8

Study

 Brainwork

1(ref)

 Co-Work

 Cohort

0.95

0.88

0.67–1.35

0.61–1.27

0.8

0.5

Study allocation

 Intervention

1(ref)

 Control

 Cohort

0.90

0.85

0.64–1.26

0.58–1.24

0.5

0.4