.18, 95% confidence interval (CI) 1.1-1.3; P<0.001. Using a multiple logistic regression model, controlling for confounding variables such as ethnicity, the summer season was noted as an independent risk factor for oligohydramnios (OR = 1.1, 95% CI 1.02-1.21; P<0.001). Another independent risk factor for oligohydramnios was Bedouin ethnicity (OR = 1.3, 95% CI 1.2-1.4; P = 0.015).