{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,18]],"date-time":"2026-04-18T01:13:49Z","timestamp":1776474829047,"version":"3.51.2"},"reference-count":21,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2023,2,24]],"date-time":"2023-02-24T00:00:00Z","timestamp":1677196800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Studies in Family Planning"],"published-print":{"date-parts":[[2023,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Family planning measures for unmarried women are based on contraceptive demand and use among sexually active women. Sexual activity status is commonly defined based on comparing reported time\u2010since\u2010last\u2010sex to a cutoff time, with women defined to be sexually active if their most recent sex was within the last four weeks. While easy to understand and compute, this approach to constructing family planning measures results in a limited understanding of family planning and exposure to unintended pregnancy because it cannot comprehensively capture the frequency of sex at the population level. We propose a new statistical approach to quantify sexual activity, using reported time\u2010since\u2010last\u2010sex data. Based on estimated frequencies of sex among users and nonusers in need of family planning, we propose new family planning measures, including the ratio of protected exposure over all women's exposure to risk of unintended pregnancy.<\/jats:p>","DOI":"10.1111\/sifp.12225","type":"journal-article","created":{"date-parts":[[2023,2,24]],"date-time":"2023-02-24T14:55:32Z","timestamp":1677250532000},"page":"145-160","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["New Measures for Family Planning and Exposure to Risk of Pregnancy Based on Sexual Activity and Contraceptive Use Data"],"prefix":"10.1111","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6340-2718","authenticated-orcid":false,"given":"Chi Hyun","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Biostatistics and Epidemiology University of Massachusetts Amherst  Amherst MA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Herbert","family":"Susmann","sequence":"additional","affiliation":[{"name":"Department of Biostatistics and Epidemiology University of Massachusetts Amherst  Amherst MA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Leontine","family":"Alkema","sequence":"additional","affiliation":[{"name":"Department of Biostatistics and Epidemiology University of Massachusetts Amherst  Amherst MA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,2,24]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/sim.1090"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1080\/01621459.1985.10478114"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S2214-109X(20)30315-6"},{"key":"e_1_2_9_5_1","volume-title":"\u201cIPUMS\u2010Demographic and Health Surveys: Version 9 [dataset]","author":"Boyle Elizabeth Heger","year":"2022"},{"key":"e_1_2_9_6_1","volume-title":"Revising Unmet Need for Family Planning (DHS Analytical Studies No. 25)","author":"Bradley Sarah E. 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