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Table 4 The association between deployment to the Gulf War and chest 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
15%
13%
7%
5%
2.33 (1.87–2.91) 18.3
Proctor 1998 Symptoms past month FD 6%
NO 3%
0%   
Unwin 1999 Symptoms past month 25.3% Bosnia 13.2%
Era 11.8%
2.53 (2.19–2.93) 27.7
Knoke 2000 Current symptoms 20.2% 10.6% 2.79 (1.61–4.84) 4.5
Cherry 2001 Symptoms past month Mean score approx 3.7 Mean score approx 2.0   
Gray 2002 Symptoms past year 16.0% DEV 6.1%
NDV 5.1%
2.93 (2.54–3.39) 28.0
Simmons 2004 Symptoms since 1990 1.7% 0.8% 2.14 (1.77–2.60) 21.5
Summary OR (95% CI) 2.52 (2.23–2.85)
Heterogeneity χ 2 = 7.4, df = 4, P = 0.115
  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. Proctor 1998: FD – Fort Devens sample, NO – New Orleans sample; data not included in meta-analysis because prevalence in reference group is zero.
  6. Unwin 1999: GWV vs Era controls compared in meta-analysis.
  7. Gray 2002: DEV – deployed elsewhere veterans, NDV – non-deployed veterans; GWV vs DEV compared in meta-analysis.