Figure 2.

Risk Difference meta-analysis of trials of high intensity nursing intervention for smoking cessation (showing proportion of patients in each trial arm who had ceased smoking at the longest follow-up). The meta-analysis is performed using a random effects model and the confidence interval of the pooled result is wider than for the fixed effects method.

Cates BMC Medical Research Methodology 2002 2:1   doi:10.1186/1471-2288-2-1
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