Application of polychotomous logistic regression in the study of risk factors predisposed to postpartum hemorrhage
Ni, H.; Zhang, G.
Hua Xi Yi Ke Da Xue Xue Bao 22(3): 318-321
1991
ISSN/ISBN: 0257-7712 PMID: 1748420 Document Number: 385993
To determine the role of history of induced abortion and pregnancy induced hypertension in postpartum hemorrhage, a polychotomous logistic regression method was introduced to analyze the data gathered in an investigation of blood loss among 933 parturients in some counties of Sichuan and Ningxia provinces. The results show that postpartum hemorrhage caused by placenta factors is related to a history of induced abortion and pregnancy induced hypertension with relative risks 2.55 (95% confidence interval = 1.2-5.3) and 4.94 (95% confidence interval = 1.8-13.2), respectively. An increased risk was noted for postpartum hemorrhage associated with pregnancy induced hypertension (relative risk = 2.58, 95% confidence interval = 1.3-5.2), but not with induced abortion. Suggestions were made for prevention of postpartum hemorrhage.