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Table 1 Characteristics of Millennium Cohort Study Participants Who Provided a Meaningful Response for the Open-Ended Question

From: Application of latent semantic analysis for open-ended responses in a large, epidemiologic study

  Panel 1 Baseline Panel 1 Follow-up Panel 2 Baseline
Characteristic All responders
n= 77,042
Open-text respondersa
n= 14,692
All responders
n= 55,021
Open-text respondersa
n= 8,937
All responders
n= 31,096
Open-text respondersa
n= 4,287
  %b %b %b %b %b %b
Sex       
Male 73.2 73.2 73.3 72.8 61.6 63.4
Female 26.8 26.8 26.7 27.2 38.4 36.6
Birth year       
Before 1960 21.6 24.2 24.5 28.1 0.7 0.9
1960-1969 37.9 39.2 40.5 40.5 5.4 6.3
1970-1979 34.6 31.8 30.8 28.1 31.9 35.6
1980 or later 5.9 4.7 4.2 3.3 62.0 57.2
Education       
High school or less 48.9 48.9 45.6 43.3 81.4 80.6
Some college 25.5 24.3 17.8 18.4 3.2 4.0
Bachelor's degree 16.5 16.7 22.1 22.7 12.3 12.7
Advanced degree 9.1 10.1 14.5 15.6 3.1 2.7
Marital status       
Married 63.1 64.1 73.3 72.8 28.1 29.0
Not married 36.9 35.9 26.7 27.2 71.9 71.0
Race/ethnicity       
White non-Hispanic 69.6 70.6 70.8 69.9 71.2 72.2
Black non-Hispanic 13.8 11.6 12.2 11.0 11.6 10.2
Other 16.7 17.8 16.9 19.1 17.1 17.6
2001-2007 deploymentc       
No 57.6 61.4 56.3 56.1 42.3 38.4
Yes 42.5 38.6 43.6 43.9 57.7 61.6
Military rank       
Enlisted 77.0 75.7 70.8 69.4 88.4 89.4
Officer 23.0 24.3 29.2 30.6 11.6 10.6
Service component       
Reserve/Guard 43.0 36.8 53.4 51.3 40.0 36.7
Active duty 57.0 63.2 46.6 48.7 60.0 63.3
Branch of service       
Air Force 29.0 25.7 30.3 24.7 26.6 17.9
Army 47.4 48.1 47.7 52.1 48.2 55.0
Navy/Coast Guard 18.5 20.6 18.1 18.8 16.9 16.8
Marine Corps 5.1 5.6 4.0 4.3 8.3 10.3
Occupational category       
Others 69.9 69.0 69.4 68.3 72.5 72.0
Combat specialists 20.0 21.2 19.2 20.3 15.7 19.1
Heath care specialists 10.4 9.8 11.4 11.4 11.8 8.9
General healthd       
Very good/excellent 59.0 48.9 55.3 45.6 54.3 41.4
Good 30.3 35.1 34.5 37.4 33.1 37.8
Fair/poor 7.7 13.3 8.9 15.9 8.9 17.7
Missing 3.0 2.7 1.3 1.0 3.6 3.1
  1. a Includes participants who had a meaningful response to the open-ended question, "Do you have any concerns that are not covered in this survey that you would like to share?"
  2. b Percentages were rounded and may not sum to 100.
  3. c Any deployment in support of the wars in Iraq and Afghanistan September 2001-October 2007.
  4. d Self-reported general health from the question, "In general, would you say your health is excellent, very good, good, fair, or poor?"