Fig 2. Meta-analysis of risk of community acquired pneumonia in current smokers relative to never smokers (Odds Ratio).

* Study by Baik et al. had relevant data subdivided by gender, therefore data from this study were included as two separate entities (i.e. men and women). Grey box = effect estimates from single studies. Diamond = pooled result with confidence interval. Vertical line at ‘1’ on the x-axis is the line of no effect. Weight (in %) = influence an individual study had on the pooled result.