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Table 2 The association between deployment to the Gulf War and muscle 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
Fukuda 1998 Current symptoms
Symptoms for 6 months
20%
18%
8%
6%
2.88 (2.35–3.53) 15.0
Ishoy 1999 No numerical data     
Kang 2000 Time period unclear 33% 17% 2.41 (2.25–2.57) 15.8
Knoke 2000 Current symptoms 7.1% 1.8% 4.10 (2.29–7.36) 10.8
Steele 2000 Symptoms past 12 months 21% 6% 4.08 (2.67–6.23) 12.8
Gray 2002 Symptoms past 12 months 22.6% DEV 6.9%
NDV 5.7%
3.96 (3.47–4.53) 15.5
Simmons 2004 Symptoms since 1990 2.0% 0.4% 5.07 (3.95–6.52) 14.6
Kelsall 2004 Symptoms past month 52% 46% 1.27 (1.10–1.47) 15.5
Summary OR (95% CI) 3.06 (2.18–4.30)
Heterogeneity χ 2 = 173.1, df = 6, 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. Fukuda 1998: data on current symptoms used in meta-analysis.
  5. Gray 2002: DEV – deployed elsewhere veterans, NDV – non-deployed veterans; GWV vs DEV compared in meta-analysis.