Association between pregnancy induced hypertension and low birth weight; a population based case-control study.

The purpose of this study was to investigate the association between pregnancy-induced hypertension and low birth weight. A population-based case control study was conducted. Antenatal mothers who attended the government health centers in the district of Kuala Muda, Kedah, Malaysia from June 2003 to May 2004 were recruited. Cases were 312 mothers who delivered low birth weight babies, and controls were 312 mothers who delivered normal birth weight babies. Face-to-face interviews using a structured questionnaire and a review of medical records were carried out. After controlling for important confounders such as gestational age at delivery, maternal age, ethnicity, education, parity, and previous history of abortion, pregnancy-induced hypertension was found to be an independent risk factor (adjusted odds ratio = 5.06; 95% confidence interval: 2.63, 9.71) for low birth weight. There was a significant association of pregnancy-induced hypertension with low birth weight. Women who delivered low birth weight babies were 5 times more likely to have had pregnancy-induced hypertension.