Interpregnancy Intervals: Impact of Postpartum Contraceptive Effectiveness and Coverage. To determine the use of contraceptive methods, defined by effectiveness, length of coverage, and their association with short interpregnancy intervals, controlling for provider type and client demographics. We identified a cohort of 117,644 women from the 2008 California Birth Statistical Master file with second or higher order birth and at least one Medicaid (Family PACT or Medi-Cal) claim within 18 months after index birth. We explored the effect of contraceptive method provision on the odds of having an optimal interpregnancy interval, controlling for covariates.
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