Table 1.

Age-Standardized^a Baseline Characteristics (%) By History of PTSD, 2001–2015

Characteristic	All service members (N = 120,572)		Men (N = 85,460)		Women (N = 35,112)
	No PTSD (n = 110,697)	PTSD (n = 9875)	No PTSD (n = 78,861)	PTSD (n = 6599)	No PTSD (n = 31,836)	PTSD (n = 3276)
Age, yearsb	27.6 (6.3)	26.2 (5.3)	28.1 (6.4)	26.5 (5.2)	26.4 (5.8)	25.7 (5.4)
Enrollment panel
2001–2003	32	18	34	18	26	18
2004–2006	17	18	15	17	22	21
2007–2009	26	28	25	27	31	32
2011–2013	25	36	26	38	22	30
Race/ethnicity
White, non-Hispanic	71	69	75	73	62	62
Black, non-Hispanic	13	12	10	10	20	18
Other	16	19	15	18	18	20
Officer rank	19	7	19	7	19	8
Service branch
Army	34	53	34	55	34	49
Navy/Coast Guard	22	20	22	18	24	24
Marine Corps	10	13	13	16	5	6
Air Force	34	14	32	12	38	21
Other mental health conditionc	8	67	5	63	13	74
Smoking status
Never	60	42	58	39	66	49
Past	21	26	22	26	19	25
Current	19	32	21	35	15	27
Heavy or problem drinking	17	34	18	38	15	28
Body mass indexd
< 25	46	41	38	34	64	55
25–29	46	46	53	51	30	36
≥ 30	8	14	9	16	6	10
Prior combat experience	21	46	24	53	15	33
Prior physical or sexual trauma	10	31	6	20	19	53

^aValues are standardized to the age distribution of the study population at the start of follow-up

^bValues are expressed as mean (standard deviation)

^cParticipants were classified as having a history of another mental health condition if they self-reported a diagnosis of depression, schizophrenia, or bipolar disorder or if they screened positive for major depression, panic disorder, or other anxiety disorders

^dWeight (kg)/height (m)²