Table 4.

Diagnostic validity (AUC) and symptom severity correlation coefficients (Pearson’s r) for different candidate PDS 2- and 3-item scales applied to Japanese participants with and without PTSD, calculated separately with clinical, university, and female subsamples.

	Clinical subsample (n = 106)		University subsample (n = 63)		Female subsample (n = 137)
Short versions of the PDS (DSM-IV Criteria)	AUC	r	AUC	r	AUC	r
Two-item version
(B1, B2)	0.80	.58	0.91	.27	0.91	.76
(B1, B3)	0.70	.46	0.92	.29	0.92	.67
(B1, B4)	0.66	.43	0.89	.25	0.89	.70
(B1, B5)	0.69	.53	0.91	.41	0.91	.78
(B2, B3)	0.79	.59	0.81	.27	0.81	.72
(B2, B4)	0.79	.57	0.88	.26	0.88	.76
(B2, B5)*	0.79	.64	0.79	.46	0.79	.81
(B3, B4)	0.62	.41	0.88	.27	0.88	.66
(B3, B5)	0.64	.50	0.79	.44	0.79	.72
(B4, B5)	0.63	.46	0.88	.39	0.88	.73
Three-item version
(B1, B2, B3)	0.79	.59	0.93	.29	0.90	.75
(B1, B2, B4)	0.76	.56	0.90	.26	0.89	.76
(B1, B2, B5)*	0.78	.63	0.91	.40	0.91	.81
(B1, B3, B4)	0.67	.46	0.90	.28	0.85	.70
(B1, B3, B5)	0.70	.53	0.91	.40	0.88	.75
(B1, B4, B5)	0.68	.50	0.90	.35	0.87	.75
(B2, B3, B4)	0.74	.57	0.89	.28	0.88	.75
(B2, B3, B5)	0.75	.63	0.79	.40	0.89	.79
(B2, B4, B5)	0.75	.59	0.88	.38	0.89	.79
(B3, B4, B5)	0.64	.48	0.88	.38	0.85	.73

* indicate values of the best candidate for the 2- or 3-item scale in the whole sample analysis. Bold numbers indicate the best candidates in the sub-sample analysis. AUC, area under the curve.