Figure 2From: Differential misclassification of confounders in comparative evaluation of hospital care quality: caesarean sections in Italy Difference in HFH prevalences between caesarean section and vaginal delivery groups a for each of 540 Italian hospitals, 2010. aThe difference in HFH prevalences was calculated with the following formula: prevalence (%) of HFH in women thatunderwent a cesarean section minus the prevalence (%) of HFH in women that underwent a vaginal delivery.Back to article page