{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T11:37:54Z","timestamp":1774611474031,"version":"3.50.1"},"reference-count":45,"publisher":"BMJ","issue":"5","funder":[{"name":"Children\u2019s Investment Fund Foundation"},{"DOI":"10.13039\/100000865","name":"Bill & Melinda Gates Foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100000865","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2018,4,27]]},"published-print":{"date-parts":[[2018,5]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Nigeria, Ethiopia and Tanzania have some of the highest teenage pregnancy rates and lowest rates of modern contraceptive use among adolescents. The transdisciplinary Adolescents 360 (A360) initiative being rolled out across these three countries uses human-centred design to create context-specific multicomponent interventions with the aim of increasing voluntary modern contraceptive use among girls aged 15\u201319 years.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The primary objective of the outcome evaluation is to assess the impact of A360 on the modern contraceptive prevalence rate (mCPR) among sexually active girls aged 15\u201319 years. A360 targets different subpopulations of adolescent girls in the three countries. In Northern Nigeria and Ethiopia, the study population is married girls aged 15\u201319 years. In Southern Nigeria, the study population is unmarried girls aged 15\u201319 years. In Tanzania, both married and unmarried girls aged 15\u201319 years will be included in the study. In all settings, we will use a prepopulation and postpopulation-based cross-sectional survey design. In Nigeria, the study design will also include a comparison group. A one-stage sampling design will be used in Nigeria and Ethiopia. A two-stage sampling design will be used in Tanzania. Questionnaires will be administered face-to-face by female interviewers aged between 18 and 26 years. Study outcomes will be assessed before the start of A360 implementation in late 2017 and approximately 24 months after implementation in late 2019.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Ethics and dissemination<\/jats:title>\n                    <jats:p>Findings of this study will be widely disseminated through workshops, conference presentations, reports, briefings, factsheets and academic publications.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2018-021834","type":"journal-article","created":{"date-parts":[[2018,6,1]],"date-time":"2018-06-01T00:01:36Z","timestamp":1527811296000},"page":"e021834","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":15,"title":["Evaluating the impact of an intervention to increase uptake of modern contraceptives among adolescent girls (15\u201319 years) in Nigeria, Ethiopia and Tanzania: the Adolescents 360 quasi-experimental study protocol"],"prefix":"10.1136","volume":"8","author":[{"given":"Christina Joanne","family":"Atchison","sequence":"first","affiliation":[{"name":"MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emma","family":"Mulhern","sequence":"additional","affiliation":[{"name":"Itad Limited, Hove, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saidi","family":"Kapiga","sequence":"additional","affiliation":[{"name":"Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK"},{"name":"Mwanza Intervention Trials Unit, Mwanza, Tanzania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mussa Kelvin","family":"Nsanya","sequence":"additional","affiliation":[{"name":"Mwanza Intervention Trials Unit, Mwanza, Tanzania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emily E","family":"Crawford","sequence":"additional","affiliation":[{"name":"Binomial Optimus Limited, Abuja, Nigeria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammed","family":"Mussa","sequence":"additional","affiliation":[{"name":"MMA Development Consultancy, Addis Ababa, Ethiopia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christian","family":"Bottomley","sequence":"additional","affiliation":[{"name":"MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James R","family":"Hargreaves","sequence":"additional","affiliation":[{"name":"Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aoife Margaret","family":"Doyle","sequence":"additional","affiliation":[{"name":"MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2018,5,31]]},"reference":[{"key":"2025121510120625000_8.5.e021834.1","unstructured":"Family Planning 2020. 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