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Volume 4, Number 2—June 1998

Synopsis

Hospitalizations for Unexplained Illnesses among U.S. Veterans of the Persian Gulf War

James D. KnokeComments to Author  and Gregory C. Gray
Author affiliations: Naval Health Research Center, San Diego, California, USA

Main Article

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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