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

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

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

* P < .01 **P < .001; 95% CI: 95% confidence intervals for OR
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

ISSN: 2050-7283