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Table 1 Demographic and military characteristics of active-duty Millennium Cohort participants (2001–2003) self-reporting medical conditions

From: Challenges of self-reported medical conditions and electronic medical records among members of a large military cohort

Characteristic*

Study population† N = 37,798 n (%)

Subjects who reported one or more conditions n = 18,581 n (%)

Sex

  

   Male

28,873 (76.4)

12,770 (68.7)

   Female

8,925 (23.6)

5,811 (31.3)

Age, years

  

   17–24

8,334 (22.1)

3,274 (17.6)

   25–34

14,324 (37.9)

6,263 (33.7)

   35–44

13,048 (34.5)

7,578 (40.8)

   >44

2,092 (5.5)

1,466 (7.9)

Education

  

   Some high school

1,072 (2.8)

540 (2.9)

   High school graduate

18,845 (49.9)

9,062 (48.8)

   Some college

10,470 (27.7)

5,159 (27.8)

   College graduate

3,855 (10.2)

1,843 (9.9)

   Advanced degree

3,556 (9.4)

1,977 (10.6)

Marital status

  

   Married

25,096 (66.4)

12,834 (69.1)

   Not married

12,702 (33.6)

5,747 (30.9)

Race/ethnicity

  

   White non-Hispanic

24,926 (65.9)

12,306 (66.2)

   Black non-Hispanic

6,153 (16.3)

3,178 (17.1)

   Other

6,719 (17.8)

3,097 (16.7)

Military pay grade

  

   Enlisted

31,337 (82.9)

15,347 (82.6)

   Officer

6,461 (17.1)

3,234 (17.4)

Previous deployment experience

  

   Nondeployed

21,788 (57.6)

11,265 (60.6)

   Deployed

16,010 (41.4)

7,316 (39.4)

Service branch

  

   Army

14,355 (38.0)

7,110 (38.3)

   Air Force

11,400 (30.1)

5,452 (29.3)

   Navy/Coast Guard

9,331 (24.7)

4,824 (26.0)

   Marines

2,712 (7.2)

1,195 (6.4)

Length of service, years

  

   0–5

7,231 (19.1)

2,909 (15.7)

   6–10

8,571 (22.7)

3,554 (19.1)

   11–15

10,250 (27.1)

4,939 (26.6)

   ≥ 16

11,746 (31.1)

7,179 (38.6)

Occupational category

  

   Combat specialists

7,505 (19.9)

3,277 (17.6)

   Electronic equipment repair

3,926 (10.4)

1,927 (10.4)

   Communications/intelligence

3,246 (8.6)

1,613 (8.7)

   Health care specialists

3,279 (8.7)

2,021 (10.9)

   Other technical & allied specialists

1,086 (2.9)

544 (2.9)

   Functional support specialists

7,385 (19.5)

3,955 (21.3)

   Electrical/mechanical

6,463 (17.1)

2,941 (15.8)

   Craft workers

1,028 (2.7)

484 (2.6)

   Service & supply handlers

2,956 (7.8)

1,470 (7.9)

   Trainees, other

924 (2.4)

349 (1.9)

  1. * Characteristic reflects status at time of study sample selection, October 2000.
  2. † Active-duty participants who answered at least one medical history question.
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BMC Medical Research Methodology

ISSN: 1471-2288

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