FIGURE 3.
Relation between milk (per 200 mL/d) and coronary heart disease: dose-response meta-analyses of 6 prospective cohort studies (n = 259,162, no. of cases = 4391). Shown are author names, reference number, year of publication, country of study, and the size of the association per study expressed in squares (size of square indicates weight of the study to the overall meta-analysis); the horizontal lines indicate 95% CIs. The last 2 columns contain the actual estimated relative risks (RRs) and 95% CIs pooled across the categories of milk exposure with the generalized least-squares method and the actual weights. On the x axis, the RR is plotted with a line through the RR (= 1) that indicates no significant association between exposure and outcome. The diamond at the bottom indicates the pooled result, with the RR in the middle and the 95% CI. A test for heterogeneity, the Higgins and Thompson I-squared value, shows how much heterogeneity is due to between-study variation with a P value (if P < 0.05).