Table 3.
Number of symptoms (mean ± SD) at time 1 and time 2 across demographic variables and cluster membership.
| Demographic variable | Time 1 | Time 2 |
|---|---|---|
| Cluster membership | ||
| Mildly symptomatic | 14.22 ± 8.67 | 16.55 ± 10.49 |
| Highly symptomatic | 34.90 ± 7.15 | 32.86 ± 9.64 |
| Sex | ||
| Male | 22.02 ± 12.96 | 22.81 ± 12.96 |
| Female | 22.73 ± 12.57 | 21.81 ± 12.03 |
| Military branch | ||
| Army | 23.47 ± 12.46 | 24.14 ± 12.76 |
| Air Force | 23.60 ± 12.39 | 23.66 ± 12.09 |
| Marines | 16.72 ± 13.86 | 18.14 ± 13.44 |
| Navy | 18.54 ± 12.44 | 18.13 ± 10.55 |
| Education | ||
| High school | 23.62 ± 13.12 | 24.31 ± 12.79 |
| College | 22.45 ± 12.95 | 23.42 ± 13.01 |
| Graduate school | 17.04 ± 11.24 | 16.33 ± 10.65 |
| Duty | ||
| Active duty | 22.77 ± 13.22 | 23.26 ± 12.93 |
| National Guard | 21.42 ± 11.78 | 23.04 ± 11.93 |
| Reserves | 20.83 ± 13.01 | 21.20 ± 13.50 |
| Race | ||
| White | 21.47 ± 12.68 | 21.41 ± 12.45 |
| Black | 25.00 ± 13.77 | 29.26 ± 13.12 |
| Marital status | ||
| Married | 22.77 ± 13.18 | 23.75 ± 13.17 |
| Divorced | 25.53 ± 13.79 | 25.26 ± 13.77 |
| Separated | 21.00 ± 13.48 | 23.62 ± 13.74 |
| Single, never married | 20.64 ± 12.26 | 20.40 ± 12.14 |
| Not married but living with mate | 20.22 ± 13.34 | 26.11 ± 11.21 |
| Rank | ||
| Enlisted | 21.54 ± 12.99 | 21.71 ± 12.69 |
| NCO | 23.85 ± 12.82 | 25.50 ± 13.14 |
| Warrant officer | 19.13 ± 16.14 | 22.25 ± 13.81 |
| Full officer | 18.29 ± 11.56 | 17.00 ± 10.16 |
| Smoker | ||
| Never smoked | 20.92 ± 13.15 | 20.87 ± 13.12 |
| Former smoker | 21.24 ± 13.17 | 23.19 ± 12.69 |
| Current smoker | 25.00 ± 11.85 | 25.54 ± 12.25 |