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Fig. 2: Risk ratios of cancer associated with pravastatin therapy as a function of the mean age of participants at enrolment. The greater the variance of a study, the smaller the area of the circle and the less that observation contributes to the overall effect. The superimposed line is obtained by random-effects meta-regression analysis using a restricted maximum likelihood method estimate of the residual heterogeneity variance. Risk ratios are displayed on a logarithmic scale. Regression equation: log risk ratio = 0.854 + 0.014 x age.
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