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Table 5 Differences in mean scale scores for cases and non-cases for evaluation of discriminant validity of trauma symptoms scales

From: Validation of the UCLA Child Post traumatic stress disorder-reaction index in Zambia

  Caseness as identified by child and caregiver report
  Fear Symptom  
  Cases (n = 195) Non-cases (n = 31) p-values
PTSD-RI symptom scale, mean (SE) 17.3 (1.3) 9.3 (2.7) 0.02
Locally-specific symptom scale, mean (SE) 15.1 (1.2) 8.6 (2.3) 0.04
Total symptom scale, mean (SE) 32.3 (2.4) 17.9 (4.8) 0.02
  Avoidance Symptom  
  Cases (n = 34) Non-cases (n = 163)  
PTSD-RI symptom scale, mean (SE) 26.7 (3.4) 11.0 (1.1) <0.001
Locally-specific symptom scale, mean (SE) 23.8 (3.2) 9.0 (1.0) <0.001
Total symptom scale, mean (SE) 50.5 (6.5) 20.0 (2.0) <0.001
  Validity Question Counts*  
  Cases (N = 38) Non-cases (N = 29)  
PTSD-RI symptom scale, mean (SE) 25.2 (3.2) 9.4 (2.8) <0.001
Locally-specific symptom scale, mean (SE) 22.1 (3.0) 9.1 (2.3) 0.002
Total symptom scale, mean (SE) 47.3 (6.1) 18.5 (4.9) <0.001
  1. * caseness was defined based on the number of cross-cultural criterion validity questions endorsed by the caregiver and child dyads. Endorsing 2 or 3 of the questions defined caseness; endorsing none of the questions defined non-caseness.