Volume 4, Number 2—June 1998
Synopsis
Hospitalizations for Unexplained Illnesses among U.S. Veterans of the Persian Gulf War
James D. Knoke
and Gregory C. Gray
and Gregory C. Gray
Table 3
Frequencies and risk ratios under the Cox proportional hazards model for all hospitalizations with at least one unexplained illness, all covariates, 1 August 1991 to 1 April 1996
| Variable | Deployed | Nondeployed | Risk ratioa | 95% Confidence interval | ||
|---|---|---|---|---|---|---|
| Not deployed | 1,479,751 | |||||
| Deployed | 552,111 | 1.08 | 1.05 - 1.11 | |||
| Not hospitalized before warb | 513,486 | 1,375,169 | ||||
| Hospitalized before war | 38,625 | 104,582 | 1.73 | 1.66 - 1.79 | ||
| Not married | 258,821 | 602,553 | ||||
| Married | 291,009 | 875,309 | 1.05 | 1.02 - 1.08 | ||
| Unknown marital status | 2282 | 1889 | 0.64 | 0.41 - 1.00 | ||
| Male | 517,223 | 1,291,323 | ||||
| Female | 33,690 | 188,273 | 2.13 | 2.06 - 2.20 | ||
| Unknown gender | 1198 | 155 | 0.60 | 0.20 - 1.75 | ||
| White | 383,704 | 1,110,949 | ||||
| Black | 130,249 | 286,427 | 1.05 | 1.02 - 1.08 | ||
| Hispanic | 12,900 | 26,696 | 0.91 | 0.83 - 1.00 | ||
| Other | 23,592 | 54,128 | 0.91 | 0.85 - 0.97 | ||
| Unknown race/ethnicity | 1666 | 1551 | 1.08 | 0.69 - 1.68 | ||
| Age in years: | 17-21 | 142,547 | 343,535 | |||
| 22-25 | 146,652 | 306,272 | 0.94 | 0.90 - 0.97 | ||
| 26-31 | 138,173 | 373,698 | 0.95 | 0.90 - 1.00 | ||
| >32 | 123,353 | 455,302 | 1.05 | 0.99 - 1.12 | ||
| Unknown | 1386 | 944 | 1.04 | 0.57 - 1.88 | ||
| Infantry, gun crews, seamanship | 140,742 | 273,079 | ||||
| Electronic equipment repair | 45,263 | 159,195 | 0.99 | 0.93 - 1.04 | ||
| Communications/intelligence | 55,665 | 120,108 | 1.00 | 0.95 - 1.06 | ||
| Health care | 28,398 | 107,591 | 1.46 | 1.39 - 1.53 | ||
| Other technical | 11,633 | 33,246 | 1.02 | 0.93 - 1.11 | ||
| Administration | 62,194 | 255,576 | 0.96 | 0.92 - 1.00 | ||
| Electrical/mechanical repair | 110,258 | 224,527 | 0.98 | 0.93 - 1.02 | ||
| Construction/related trades | 19,424 | 47,800 | 1.11 | 1.03 - 1.20 | ||
| Supply handlers | 53,966 | 113,093 | 1.11 | 1.06 - 1.17 | ||
| Trainees, undesignated | 6421 | 64,625 | 1.02 | 0.95 - 1.10 | ||
| Unknown job category | 18,147 | 80,911 | 1.18 | 1.11 - 1.25 | ||
| Enlisted | 489,034 | 1,238,790 | ||||
| Warrant Officer | 7760 | 13,555 | 0.79 | 0.69 - 0.89 | ||
| Commissioned Officer | 53,121 | 227,381 | 0.70 | 0.65 - 0.75 | ||
| Unknown status | 2196 | 25 | 0.43 | 0.20 - 0.93 | ||
| Salary/month: | < $1000 | 122,161 | 328,187 | |||
| $1000-$1399 | 269,500 | 573,995 | 0.81 | 0.77 - 0.85 | ||
| $1400-$2099 | 75,523 | 252,923 | 0.68 | 0.63 - 0.72 | ||
| $2100-$3199 | 60,528 | 200,295 | 0.73 | 0.68 - 0.79 | ||
| >$3200 | 22,203 | 124,326 | 0.74 | 0.66 - 0.83 | ||
| Unknown | 2196 | 25 | - | |||
| Army | 258,858 | 459,644 | ||||
| Navy | 141,604 | 423,138 | 0.61 | 0.59 - 0.64 | ||
| Marine Corps | 83,377 | 113,467 | 0.66 | 0.63 - 0.70 | ||
| Air Force | 67,942 | 447,125 | 0.76 | 0.73 - 0.78 | ||
| Coast Guard | 330 | 36,377 | 0.42 | 0.37 - 0.48 | ||
| Service in months: | < 22 | 124,629 | 262,260 | |||
| 22-54 | 162,123 | 269,727 | 1.05 | 1.00 - 1.11 | ||
| 55-126 | 133,608 | 363,138 | 0.97 | 0.92 - 1.02 | ||
| >127 | 131,751 | 584,626 | 1.12 | 1.07 - 1.18 | ||
aRisk ratios are relative to the first group in each variable category. When the algorithm failed to converge, because of lack of cases in the category, a dash (-) is given.
bIn the 12 months preceding 1 August 1990.
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