Table 3 presents the unadjusted ORs for the association between each risk factor and PIH for the entire population. The risk of PIH increased with each BMI category and became
significant starting with a BMI in the overweight range (OR 1.99, 95% CI 1.73-2.31) and increased to the greatest odds among women with a BMI of≥ 40 kg/m2 (OR 4.26, 95% CI
3.37-5.38). Also significant was a diagnosis of chronic hypertension, the presence of prepregnancy diabetes, a diagnosis of gestational diabetes, and weight gain of 40 lb. Race was a significant factor, with black women at greatest risk compared to white women, but Hispanic and Asian women were at risk. Nulliparity also conferred a higher risk for PIH, whereas tobacco use did not. Insurance type was not associated with an increased odds of PIH; however, being unmarried was associated with a small increase (OR 1.23 95%
CI 1.10-1.39) compared with being married.