(a) Outline the problem with heterogeneity among samples in a meta‐ analysis. (b) Figure 26.7 is from a study comparing the OR for births by Caesarean section to women with private health insurance...

(a) Outline the problem with heterogeneity among samples in a meta‐ analysis. (b) Figure 26.7 is from a study comparing the OR for births by Caesarean section to women with private health insurance and to women with public health insurance. The authors wondered whether or not financial incentives associated with private insurance may encourage health care providers to perform more Caesarean sections. Do you think there is evidence of heterogeneity in the forest plot of Figure 26.7? (c) What do you conclude from the results of the meta‐analysis?