From a prospective cohort study, 2510 pregnant women were recruited over a six-month period in
Egypt in 2004. PPH was defined as blood loss≥500 ml. Measures of blood loss were made every 20 minutes for
the first 4 hours after delivery using a calibrated under the buttocks drape. Using all variables available in the
patients’ charts, we divided them in ante-partum and intra-partum factors. We employed logistic regression to
analyze socio-demographic, medical and past obstetric history, and labor and delivery outcomes as potential PPH
risk factors. Post-model predicted probabilities were estimated using the identified risk factors