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Among other things, obesity is known to be associated with increased risks for surgical morbidity and perinatal complications, but the effect of obesity on a woman’s ability to become pregnant (fecundity) is less well documented. Investigators analyzed data for 7327 women (from a total of more than 59,000) from the very old (1959–1965), but still useful, Collaborative Perinatal Project. All the women had planned pregnancies, time-to-pregnancy estimates, and known BMI indexes.
Median time to pregnancy was 3 months overall, 4 months for overweight women (BMI, 25.0–29.9), and 5 months for obese women (BMI ≥30). After adjustment for age, odds ratios for conceiving in a given cycle (fecundability) were 0.84 (95% confidence interval, 0.77–0.92) fo…