Figure 3

Relationship between passive smoke exposure by any household member and the risk of lower respiratory infection (LRI) in infancy using a meta-analysis of comparative epidemiologic studies (Data are presented as odds ratios sub-grouped by the definition of LRI outcome). Squares denote the odds ratio (OR) for a single study with horizontal lines denoting 95% confidence intervals. The centre of the diamond denotes the pooled OR and the corners the 95% confidence intervals. An OR > 1 indicates a higher risk of the outcome in those exposed to passive smoke.