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Table 6 True positive and negatives (TP, TN), false positive and negatives (FP, FN), chi-square (X2) results, odds ratios (OR), sensitivity (%) and specificity (%) results for IES-R total cut-off scores for probable PTSD and DASS-21 anxiety domain

From: Prevalence and psychometric screening for the detection of major depressive disorder and post-traumatic stress disorder in adults injured in a motor vehicle crash who are engaged in compensation

Cut off score TP TN FP FN X 2 OR 95% CI Sensitivity Specificity
IES-R
Total score
 32 19 43 45 2 10.8* 9.1* 2.0–41.3 90.5 48.9
 33 19 44 44 2 11.4* 9.5* 2.1–43.2 90.5 50.0
 34 19 46 42 2 12.6* 10.4* 2.3–47.4 90.5 52.3
 35 19 47 41 2 13.2** 10.9* 2.4–49.6 90.5 53.4
 36 19 50 38 2 15.2** 12.5* 2.7–57.0 90.5 56.8
 40 19 54 34 2 18.2** 15.1** 3.3–68.9 90.5 61.4
DASS-21
Anxiety
 6 19 46 42 2 12.6** 10.4* 2.3–47.4 90.5 52.3
 7 19 49 39 2 14.5** 11.9* 2.6–54.4 90.5 55.7
 8 19 49 39 2 14.5** 11.9* 2.6–54.4 90.5 55.7
 9 17 55 33 4 12.9** 7.1* 2.2–22.8 80.1 62.5
  1. * P < .01 **P < .001; 95% CI: 95% confidence intervals for OR
  2. Note: IES-R cut-offs below 32 produce increased FN. IES-R cut-offs above 36 continue to produce reduced FP, but are becoming distant from the historical recommendation norm of 33