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Table 6 The association between deployment to the Gulf War and abdominal 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
Sostek 1996 Current symptoms 70% 9% 23.5 (7.27–76.1) 6.5
Kang 2000 Time period unclear 23% 12% 2.19 (2.03–2.36) 32.2
Knoke 2000 Current symptoms 3.4% 1.3% 2.74 (1.31–5.73) 12.6
Steele 2000 Symptoms past 12 months 15% 4% 4.33 (2.57–7.28) 18.2
Cherry 2001 Symptoms past month Mean score approx 4.0 Mean score approx 2.5   
Gray 2002 Symptoms past 12 months 13.4% DEV 5.1%
NDV 4.4%
2.87 (2.45–3.36) 30.5
Summary OR (95% CI) 3.23 (2.31–4.51)
Heterogeneity χ 2 = 29.8, 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.
  4. Gray 2002: DEV – deployed elsewhere veterans, NDV – non-deployed veterans; GWV vs DEV compared in meta-analysis.