Figure 1From: Evaluating heterogeneity in cumulative meta-analysesCumulative meta-analytic estimates of the odds ratio (OR) for clonidine, nicotine replacement therapy (gum and patch), physician advice and acupuncture as smoking cessation interventions across time are shown in the first row of graphs. The second row outlines the development of Cochrane's Q. The last row describes the trends in I 2. All analyses were cumulated by publication date.Back to article page