Forest plots from meta-analysis of standardized mean difference in circulating tumor necrosis factor α (A), interleukin 1 (B) and interleukin 6 (C) for patients with CHF randomized to fish oil or placebo. The effect size of each study is proportional to the statistical weight. The diamond indicates the overall summary estimate for the analysis; the width of the diamond represents the 95% CI. CHF, chronic heart failure; TNF-α, tumor necrosis factor α; IL-1, interleukin 1; IL-6, interleukin 6; SMD, standardized mean difference; CI, confidence interval.
Xin et al. BMC Cardiovascular Disorders 2012 12:77 doi:10.1186/1471-2261-12-77