Fig. 3From: Needle exchange programs for the prevention of hepatitis C virus infection in people who inject drugs: a systematic review with meta-analysisForest plot for the odds of hepatitis C infection among needle exchange program participants. The black squares represent the odds of hepatitis C infection observed in each study with the 95% confidence intervals represented by the lines on each side of the squares. The diamond represents the pooled odds of hepatitis C infection with the 95% confidence interval indicated by the left and right extremes of the diamondBack to article page