Health impact of US military service in a large population-based military cohort: findings of the Millennium Cohort Study, 2001-2008

Table 1 Characteristics of Millennium Cohort Study Participants by Panel and Deployment Experience

	Panel 1			Panel 2		Panel 3
	All Participants	2001-2009 Deployment Experience^b	Previous Deployment Experience^c	All Participants	2001-2009 Deployment Experience^b	All Participants	2001-2009 Deployment Experience^b
	N = 77 047	N = 35 564	N = 28 897	N = 31 110	N = 19 598	N = 43 440	N = 27 777
	n (%)^a	%	%	n (%)^a	%	n (%)^a	%
Gender
Male	56 415 (73.2)	80.5	86.7	19 167 (61.6)	68.0	27 941 (64.3)	71.1
Female	20 632 (26.8)	19.5	13.3	11 943 (38.4)	32.0	15 499 (35.7)	28.9
Birth year
Before 1960	16 652 (21.6)	13.4	18.0	226 (0.7)	0.6	69 (0.2)	0.1
1960-1969	29 177 (37.9)	39.3	45.7	1678 (5.4)	4.4	735 (1.7)	1.4
1970-1979	26 672 (34.6)	40.6	35.3	9934 (31.9)	29.7	6820 (15.7)	15.3
1980 or later	4546 (5.9)	6.7	1.0	19 272 (62.0)	65.4	35 816 (82.4)	83.3
Military rank
Enlisted	59 318 (77.0)	76.8	78.0	27 482 (88.3)	88.5	38 455 (88.5)	88.5
Officer	17 729 (23.0)	23.2	22.0	3628 (11.7)	11.5	4985 (11.5)	11.5
Service component
Reserve/National Guard	33 157 (43.0)	37.3	25.6	12 459 (40.1)	34.9	8992 (20.7)	17.0
Active duty	43 890 (57.0)	62.7	74.4	18 651 (60.0)	65.1	34 448 (79.3)	83.0
Service branch
Army	36 481 (47.4)	49.3	38.5	14 995 (48.2)	54.9	15 798 (36.4)	40.6
Air Force	22 357 (29.0)	30.2	37.5	8276 (26.6)	23.5	12 918 (29.7)	26.8
Navy	14 268 (18.5)	15.3	19.8	5263 (16.9)	14.2	7922 (18.2)	15.0
Marine Corps	3941 (5.1)	5.1	4.3	2576 (8.3)	7.4	6802 (15.7)	17.5
Military occupation
Combat specialists	15 425 (20.0)	23.7	24.0	4868 (15.7)	18.9	6591 (15.2)	18.4
All others	61 622 (80.0)	76.3	76.0	26 242 (84.4)	81.1	36 849 (84.8)	81.6

^a Percentages rounded up and may not sum to 100.
^b Deployed in support of the Global War on Terrorism between September 1, 2001, and August 31, 2007.
^c Deployed to the 1991 Gulf War or to Bosnia, Kosovo, or Southwest Asia between 1998 and 2000.

ISSN: 1471-2458