Obesity is widespread in the United States and has been proposed as a risk factor for unintended pregnancy. This study examined the association between body mass index (BMI) and unintended pregnancy using Cycle 6 of the National Survey of Family Growth, a nationally representative sample of 7,643 reproductive-aged women. Multivariable logistic regression adjusted for socioeconomic, demographic, and health factors showed no significant association between BMI and unintended pregnancy in the past five years. Obese women were more likely to use highly effective contraception and less likely to use none. These findings differ from prior case-control studies and underscore the value of population-based analyses.
