“…Second, our method of selecting risk factors for the indirect standardization procedure may have identified underlying risk factors that are not usually understood to be associated with cesarean delivery but that are more commonly found in the practices of family physicians. For example, anemia and substance abuse have been described as important risk factors for cesarean delivery,30,31 yet these risk factors are not usually included in the strategies that direct family physicians to co-manage or refer their pregnant patients to obstetrician-specialists 1,2. Furthermore, because anemia and substance abuse may be more prevalent in socio-economically disadvantaged groups, and because family physicians often have higher percentage of socio-economically disadvantaged patients in their practices than obstetrics-specialists,21 it is reasonable to consider that the practices of family physicians may contain higher levels of certain mild-moderate risk for cesarean delivery in a systematic way.…”