Table 3. Concordance between Past-Month ICD-11 and Past-Month DSM-5 PTSD Diagnoses for Samples 1 (U.S. National) & 2 (VA PTSD Clinic Sample).

		DSM-5 Diagnosis
		Negative	Positive	Total
Sample 1 (Community)	ICD-11
	Negative	2,575 (95.6)	54 (2.0)	2,629 (97.6)
	Positive	21 (0.8)	45 (1.7)	66 (2.4)
	Total	2,596 (96.3)	99 (3.7)	2,695 (100.0)
Sample 2 (VA)	ICD-11
	Negative	182 (57.0)	26 (8.1)	208 (65.2)
	Positive	12 (3.7)	99 (31.0)	111 (34.8)
	Total	194 (60.8)	125 (39.2)	319 (100)

Note. DSM = Diagnostic and Statistical Manual; ICD = International Classification of Diseases; PTSD = posttraumatic stress disorder; Values in each cell are numbers of participants followed be the percentage of total in parentheses. Diagnoses were based on symptoms endorsed moderately severe or higher (i.e., 3 or greater on a 5 point severity scale). In Sample 2, 4 subjects had missing data that precluded calculation of these cross-tabs so percentages differ slightly from Table 2.