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Table 5 The association between deployment to the Gulf War and back pain amongst veterans.

From: Pain in veterans of the Gulf War of 1991: a systematic review

Study Period of prevalence estimate Prevalence GWV Prevalence NGV OR (95% CI) % weight in meta-analysis
Doebbeling 2000 Symptoms past 12 months 37% 16% 2.25 (1.92–2.64) 23.0
Goss Gilroy 1998 Time period unclear Age 20–44 yrs
20.2%
Age 45–64 yrs
25.6%
Age 20–44 yrs
15.3%
Age 45–64 yrs
19.9%
  
Proctor 2001 Symptoms past month 21.4% 21.7% 0.97 (0.43–2.18) 7.0
Kang 2000 Time period unclear 44% 30% 1.83 (1.73–1.94) 25.0
Knoke 2000 Current symptoms 50.9% 40.4% 1.53 (1.23–1.90) 21.4
Kelsall 2004 Symptoms past month 52% 49% 1.14 (0.99–1.32) 23.5
Summary OR (95% CI) 1.58 (1.23–2.04)
Heterogeneity χ 2 = 49.8, df = 4, P < 0.001
  1. GWV – Gulf War veterans; NGV – non-Gulf veterans.
  2. OR – odds ratio. Individual study ORs based on published prevalence data and not adjusted for confounders.
  3. Summary OR – weighted average of all individual study ORs, derived from "metan" command in Stata version 9.0 using a random effect model and DerSimonian and Laird method.