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. 2019 Jul 18;14(7):e0220204. doi: 10.1371/journal.pone.0220204

Fig 4. Meta-analysis of incidence of community acquired pneumonia in current smokers relative to never smokers (Hazards Ratio).

Fig 4

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.