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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 4

Frequencies and risk ratios under the Cox proportional hazards model for all hospitalizations with at least one unexplained illness, selected demographic variables, 1 August 1991 to 1 April 1996

Variable Deployed Nondeployed Risk ratioa 95% Confidence interval
Not deployed - 1,479,751
Deployed 552,111 - 1.06 1.03 - 1.09
Not hospitalized before warb,c 513,486 1,375,169
Hospitalized before war 38,625 104,582 1.71 1.65 - 1.78
Malec 518,421 1,291,478
Female 33,690 188,273 2.11 2.04 - 2.18
White 383,704 1,110,949
Black 130,249 286,427 1.04 1.01 - 1.08
Other race/ethnicityc 38,158 82,375 0.91 0.86 - 0.96
All other occupationsc 523,713 1,372,160
Health-care worker 28,398 107,591 1.44 1.38 - 1.50
Enlisted 489,034 1,238,790
Officerc 63,077 240,961 0.66 0.62 - 0.70
Salary/month: < $1,000 122,161 328,187
$1,000-$1,399 269,500 573,995 0.77 0.74 - 0.79
> $1,400c 160,450 577,569 0.82 0.78 - 0.87
Army 258,858 459,644
Other branches 293,253 1,202,107 0.60 0.58 - 0.62

aRisk ratios are relative to the first category for each variable.
bIn the 12 months preceding 1 August 1990.
cIncludes unknown.

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