Change and stability in contraceptive use patterns among US women over a 12-month period: analysis using the 2013-2015 National Survey of Family Growth life history calendar.

Objective: To improve understanding of contraceptive use over 1 year among women in the United States.

Study Design: We used the 2013-2015 National Survey of Family Growth to examine monthly contraceptive use patterns over a 12-month period. We focused on use of contraception during months in which non-sterilized women were sexually active and not pregnant; our outcomes were contraceptive use in every month, some months, and no months.

Health insurance coverage and contraceptive use at the state level: findings from the 2017 Behavioral Risk Factor Surveillance System.

Objective: To examine associations between health insurance coverage, income level and contraceptive use - overall and most/moderately effective method use - among women ages 18-44 at risk of pregnancy, within and across 41 United States jurisdictions in 2017.

Study Design: Using data from the 2017 Behavioral Risk Factor Surveillance System, we calculated the proportions of women using any contraceptive method and using a most or moderately effective method for each state/territory and across all jurisdictions, categorized by health insurance coverage and income groups. For both contraceptive use outcomes, we ran simple and multivariable logistic regression models to test for significant differences in outcomes between insured and uninsured individuals.