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Table 1 Characteristics of Millennium Cohort Study Members at Baseline and the US Military in October 2000

From: The physical and mental health of a large military cohort: baseline functional health status of the Millennium Cohort

Characteristic*

Cohort† N = 75,413 n (%)

Invited Cohort‡ N = 207,683 (%)

US Military§ N = 2,140,959 (%)

Sex

    

   Male

55,307

(73.3)

(76.3)

(84.8)

   Female

20,106

(26.7)

(23.7)

(15.2)

Age, years

    

   17–24

14,249

(18.9)

(27.8)

(32.1)

   25–34

26,479

(35.1)

(35.8)

(34.0)

   35–44

24,891

(33.0)

(27.0)

(25.3)

   > 44

9,794

(13.0)

(9.5)

(8.6)

Education

    

   No high school diploma

4,620

(6.1)

(7.5)

(8.2)

   High school diploma diploma/equivalent

32,329

(42.9)

(49.1)

(53.3)

   Some college

19,333

(25.6)

(25.0)

(21.0)

   College degree

19,131

(25.4)

(18.5)

(17.4)

Marital status

    

   Never married

22,568

(29.9)

(38.3)

(41.0)

   Married

47,680

(63.2)

(55.6)

(54.0)

   Divorced

5,165

(6.9)

(6.1)

(5.1)

Race/ethnicity

    

   White non-Hispanic

52,613

(69.8)

(66.0)

(67.8)

   Black non-Hispanic

10,294

(13.7)

(18.3)

(18.9)

   Asian/Pacific Islander

5,983

(7.9)

(6.3)

(3.3)

   Hispanic

4,838

(6.4)

(7.1)

(7.9)

   Other

1,685

(2.2)

(2.3)

(2.1)

1998–2000 deployment to Bosnia, Kosovo, or Southwest Asia

    

   No

52,590

(69.7)

(70.0)

(90.0)

   Yes

22,823

(30.3)

(30.0)

(10.0)

Length of service, years

    

   0–3

13,661

(18.1)

(21.9)

(31.0)

   4–8

17,042

(22.6)

(26.7)

(21.0)

   9–15

19,530

(25.9)

(23.8)

(21.0)

   ≥ 16

25,180

(33.4)

(27.5)

(27.1)

Military rank

    

   Enlisted

58,228

(77.2)

(83.9)

(84.6)

   Warrant officer

1,345

(1.8)

(1.2)

(1.1)

   Commissioned officer

15,840

(21.0)

(15.0)

(14.2)

Service component

    

   Reserve/National Guard

32,418

(43.0)

(47.3)

(41.5)

   Active duty

42,995

(57.0)

(52.7)

(58.5)

Branch of service

    

   Army

35,773

(47.4)

(44.9)

(46.5)

   Air Force

22,074

(29.3)

(29.6)

(24.3)

   Navy and Coast Guard

13,696

(18.2)

(19.3)

(20.5)

   Marines

3,870

(5.1)

(6.2)

(8.6)

Occupational category

    

   Combat specialists

15,083

(20.0)

(20.8)

(22.3)

   Other occupations

60,330

(80.0)

(79.2)

(77.7)

  1. * All characteristics are significantly different between the Cohort, Invited Cohort, and US Military (p < .05).
  2. † Only participants with complete demographic data, mental component summary and physical component summary scores were included in this study.
  3. ‡ Includes invited members who were contacted by US Postal Service mail at least one time and had complete demographic data, with the exception of length of service.
  4. § Based on US military service rosters of October 2000 with complete demographic data.
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