Interpregnancy intervals of less than 18 months by Medicaid enrollment in Alaska

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Definitions: Number and percent of persons with less than 18 months between pregnancies among all second or higher order singleton births per year by Medicaid enrollment
Alaska links vital records to Medicaid/CHIP enrollment data records to determine enrollment of either parent or infant at the time of the birth.

Interpregnancy intervals are calculated as months from previous live birth to the most recent birth's estimated date of conception. Thus, the analysis is limited to second or higher order singleton births and further excludes (1) births with implausible interpregnancy interval lengths as well as (2) births involving a prior pregnancy that did not result in a live birth.

Data Source: Alaska Section of Health Analytics and Vital Records
The SAS code for calculating interpregnancy intervals was developed with the assistance of the National Institute for Children's Health Quality during Alaska's participation in the National Infant Mortality Collaborative Improvement and Innovation Network (IM CoIIN) from 2014 to 2017.

Footnotes: Updated October 2020