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Table 1 Demographic and Deployment Characteristics of US Marine Corps Health Assessment Project Participants

From: Risk Factors for Posttraumatic Stress Disorder Among Deployed US Male Marines

  Study population
N= 706
  n %a
Baseline characteristics   
Age, years   
   17-20 553 78.3
   21-31 153 21.7
Education   
   High school or less 528 74.8
   More than high school 178 25.2
Race/ethnicity   
   White non-Hispanic 474 67.1
   Hispanic 166 23.5
   Other 66 9.4
Adverse childhood experiences   
   0 353 50.0
   1 244 34.6
   2-7 109 15.4
Prior violence exposures   
   0 407 57.6
   1 179 25.4
   2-7 120 17.0
Potential problem drinking   
   No 644 91.2
   Yes 62 8.8
Number of close friends/relatives   
   0-2 203 28.7
   3-4 261 37.0
   5 or more 242 34.3
Follow-up characteristics   
Number of close friends/relatives   
   0-2 202 28.6
   3-4 222 31.4
   5 or more 282 39.9
Enlisted pay grade   
   Junior enlisted (E1-E3) 334 47.3
   Noncommissioned officer (E4-E5) 372 52.7
Number of deployments   
   1 433 61.3
   2 273 38.7
Length of last deployment   
   1-120 days 211 29.9
   121-240 days 441 62.5
   >240 days 54 7.7
Cumulative length of deploymentsb   
   31-120 days 136 19.3
   121-240 days 308 43.6
   241-360 days 172 24.4
   >360 days 90 12.8
Gap timec   
   0 days 257 36.4
   1-180 days 222 31.4
   >180 days 227 32.2
Number of Combat Exposures Types   
   0-1 267 37.8
   2-3 257 36.4
   4-6 182 25.9
  1. aPercents may not add to 100 due to rounding.
  2. bCumulative number of days deployed for all deployments that occurred between baseline and follow-up surveys.
  3. cNumber of days from last deployment to follow-up survey completion. If survey was completed while on deployment, gap time equals zero.