Table 1

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

Characteristic*

CohortN = 75,413 n (%)

Invited CohortN = 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)


* All characteristics are significantly different between the Cohort, Invited Cohort, and US Military (p < .05).

Only participants with complete demographic data, mental component summary and physical component summary scores were included in this study.

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.

§ Based on US military service rosters of October 2000 with complete demographic data.

Smith et al. BMC Public Health 2007 7:340   doi:10.1186/1471-2458-7-340

Open Data