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ObjectiveTo determine recent trends in maternal prepregnancy body mass index (BMI) and to quantify its association with birth and maternal outcomes.MethodsA population-based retrospective cohort study included resident women with singleton births in the California Birth Statistical Master Files (BSMF) database from 2007 to 2016. There were 4,621,082 women included out of 5,054,968 women registered in the database. 433,886 (8.6%) women were excluded due to invalid or missing information for BMI. Exposures were underweight (BMI < 18.5 kg/m2), normal weight (18.5-24.9 kg/m2), overweight (25.0-29.9 kg/m2), and obese (≥ 30 kg/m2) at the onset of pregnancy. Obesity was subcategorized into class I (30.0-34.9 kg/m2), class II (35.0-39.9 kg/m2), and class III (≥ 40 kg/m2), while adverse outcomes examined were low birth weight (LBW), very low birth weight (VLBW), macrosomic births, preterm birth (PTB), very preterm birth (VPTB), small-for-gestational-age birth (SGA), large-for-gestational-age birth (LGA), and cesarean delivery (CD). Descriptive analysis, simple linear regression, and multivariate logistic regression were performed, and adjusted odds ratios (AORs) with 95% confidence intervals (CIs) for associations were estimated.ResultsOver the ten-year study period, the prevalence of underweight and normal weight women at time of birth declined by 10.6% and 9.7%, respectively, while the prevalence of overweight and obese increased by 4.3% and 22.9%, respectively. VLBW increased significantly with increasing BMI, by 24% in overweight women and by 76% in women with class III obesity from 2007 to 2016. Women with class III obesity also had a significant increase in macrosomic birth (170%) and were more likely to deliver PTB (33%), VPTB (66%), LGA (231%), and CD (208%) than women with a normal BMI. However, obese women were less likely to have SGA infants; underweight women were 51% more likely to have SGA infants than women with a normal BMI.ConclusionsIn California from 2007 to 2016, there was a declining trend in women with prepregnancy normal weight, and a rising trend in overweight and obese women, particularly obesity class III. Both extremes of prepregnancy BMI were associated with an increased incidence of adverse neonatal outcomes; however, the worse outcomes were prominent in those women classified as obese.

ObjectivesTo compare rates of postpartum care and contraception provided to women with gestational or preconception diabetes mellitus to women with no known diabetes mellitus.MethodsA retrospective cohort study of 199,860 women aged 15-44 years who were continuously enrolled in California's Medicaid program, Medi-Cal, from 43 days prior to 99 days after delivering in 2012. Claims for postpartum clinic visits and contraceptive supplies were compared for 11,494 mothers with preconception diabetes, 17,970 mothers with gestational diabetes, and 170,396 mothers without diabetes. Multivariable logistic regression was used to control for maternal age, race/ethnicity, primary language, residence in a primary care shortage area, state-funded healthcare program and Cesarean delivery, when examining the effects of diabetes on postpartum care and contraception.ResultsAlthough postpartum clinic visits were more common with diabetes (55% preconception, 55% gestational, 48% no diabetes, p=

BackgroundConsiderable racial and ethnic disparities have been identified in maternal and infant health in the United States, and access to postpartum care likely contributes to these disparities. Contraception is an important component of postpartum care that helps women and their families achieve optimal interpregnancy intervals and avoid rapid repeat pregnancies and preterm births. National quality measurements to assess postpartum contraception are being developed and piloted.ObjectiveTo assess racial/ethnic variation in receipt of postpartum care and contraception among low-income women in California.Study designWe conducted a prospective cohort study of 199,860 Californian women aged 15-44 with a Medicaid-funded delivery in 2012. We examined racial/ethnic variation of postpartum care and contraception using multivariable logistic regression to control for maternal age, language, cesarean delivery, Medicaid program, and residence in a primary care shortage area (PCSA).ResultsOnly one-half of mothers attended a postpartum visit (49.4%) or received contraception (47.5%). Compared with white women, black women attended postpartum visits less often (adjusted odds ratio [aOR], 0.73; 95% confidence interval [CI], 0.71-0.76), were less likely to receive any contraception (aOR, 0.83; 95% CI, 0.78-0.89) and were less likely to receive highly effective contraception (aOR, 0.64; 95% CI, 0.58-0.71). Women with Spanish as their primary language were more likely to get any contraception (aOR, 1.15; 95% CI, 1.11-1.19) but had significantly lower odds of receiving a highly effective method (aOR, 0.94; 95% CI, 0.90-0.99) compared with women with English as their primary language. Similarly, women in PCSAs had a greater odds of getting any contraception (aOR, 1.06; 95% CI, 1.03-1.09), but 24% lower odds of getting highly effective contraception than women not living in PCSAs (aOR, 0.76; 95% CI, 0.73-0.79).ConclusionSignificant racial/ethnic disparities exist among low-income Californian mothers' likelihood of attending postpartum visits and receiving postpartum contraception as well as receiving highly effective contraception.