Low validity of self-report in identifying recent mental health diagnosis among U.S. service members completing Pre-Deployment Health Assessment (PreDHA) and deployed to Afghanistan, 2007: a retrospective cohort study

Table 1 Demographics of the study cohort¹ and those with a recent mental health disorder diagnosis²

	Study cohort		Subjects with a recent mental health disorder diagnosis
	Number	(Percentage)	Number	(Percentage)
Total	15195	(100)	615	(100)
Gender
Male	13816	(90.9)	506	(82.3)
Female	1379	(9.1)	109	(17.7)
Prior deployments
0	10180	(67.0)	362	(58.9)
1+	5015	(33.0)	253	(41.1)
Military occupation
Combat	3810	(25.1)	125	(20.3)
Non-combat	11385	(74.9)	490	(79.7)
Age
18-19	503	(3.3)	22	(3.6)
20-29	9558	(62.9)	396	(64.4)
30-39	3737	(24.6)	151	(24.6)
40-49	1255	(8.3)	45	(7.3)
50+	142	(0.9)	1	(0.2)

Note: Significant difference by gender (P < 0.001), prior deployment (P < 0.001), and military occupation (P = 0.006) by Chi-square.
1. Demographic characteristics as of the deployment date.
2. Record of one or more pertinent ICD-9CM diagnosis codes in the full year prior to date of deployment.

ISSN: 1471-2458