{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T23:36:40Z","timestamp":1792193800350,"version":"4.4.0"},"reference-count":84,"publisher":"National Institute for Health and Care Research","issue":"54","license":[{"start":{"date-parts":[[2014,8,1]],"date-time":"2014-08-01T00:00:00Z","timestamp":1406851200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/www.nationalarchives.gov.uk\/doc\/non-commercial-government-licence\/non-commercial-government-licence.htm"}],"funder":[{"DOI":"10.13039\/501100000276","name":"National Institute for Health Research","doi-asserted-by":"publisher","award":["06\/07\/01"],"award-info":[{"award-number":["06\/07\/01"]}],"id":[{"id":"10.13039\/501100000276","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec id=\"abs1-1\">\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Smoking during pregnancy causes many adverse pregnancy and birth outcomes. Nicotine replacement therapy (NRT) is effective for cessation outside pregnancy but efficacy and safety in pregnancy are unknown. We hypothesised that NRT would increase smoking cessation in pregnancy without adversely affecting infants.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-2\">\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To compare (1) at delivery, the clinical effectiveness and cost-effectiveness for achieving biochemically validated smoking cessation of NRT patches with placebo patches in pregnancy and (2) in infants at 2 years of age, the effects of maternal NRT patch use with placebo patch use in pregnancy on behaviour, development and disability.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-3\">\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Randomised, placebo-controlled, parallel-group trial and economic evaluation with follow-up at 4 weeks after randomisation, delivery and until infants were 2 years old. Randomisation was stratified by centre and a computer-generated sequence was used to allocate participants using a 1\u2009:\u20091 ratio. Participants, site pharmacies and all study staff were blind to treatment allocation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-4\">\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>Seven antenatal hospitals in the Midlands and north-west England.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-5\">\n                    <jats:title>Participants<\/jats:title>\n                    <jats:p>Women between 12 and 24 weeks\u2019 gestation who smoked \u2265\u200910 cigarettes a day before and \u2265\u20095 during pregnancy, with an exhaled carbon monoxide (CO) reading of \u2265\u20098\u2009parts per million (p.p.m.).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-6\">\n                    <jats:title>Interventions<\/jats:title>\n                    <jats:p>NRT patches (15\u2009mg per 16 hours) or matched placebo as an 8-week course issued in two equal batches. A second batch was dispensed at 4 weeks to those abstinent from smoking.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-7\">\n                    <jats:title>Main outcome measures<\/jats:title>\n                    <jats:p>Participants: self-reported, prolonged abstinence from smoking between a quit date and childbirth, validated at delivery by CO measurement and\/or salivary cotinine (COT) (primary outcome). Infants, at 2 years: absence of impairment, defined as no disability or problems with behaviour and development. Economic: cost per \u2018quitter\u2019.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-8\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>One thousand and fifty women enrolled (521 NRT, 529 placebo). There were 1010 live singleton births and 12 participants had live twins, while there were 14 fetal deaths and no birth data for 14 participants. Numbers of adverse pregnancy and birth outcomes were similar in trial groups, except for a greater number of caesarean deliveries in the NRT group. Smoking: all participants were included in the intention-to-treat (ITT) analyses; those lost to follow-up (7% for primary outcome) were assumed to be smoking. At 1 month after randomisation, the validated cessation rate was higher in the NRT group {21.3% vs. 11.7%, odds ratio [OR], [95% confidence interval (CI)] for cessation with NRT, 2.05 [1.46 to 2.88]}. At delivery, there was no difference between groups\u2019 smoking cessation rates: 9.4% in the NRT and 7.6% in the placebo group [OR (95% CI), 1.26 (0.82 to 1.96)]. Infants: at 2 years, analyses were based on data from 888 out of 1010 (87.9%) singleton infants (including four postnatal infant deaths) [445\/503 (88.5%) NRT, 443\/507 (87.4%) placebo] and used multiple imputation. In the NRT group, 72.6% (323\/445) had no impairment compared with 65.5% (290\/443) in placebo (OR 1.40, 95% CI 1.05 to 1.86). The incremental cost-effectiveness ratio for NRT use was \u00a34156 per quitter (\u00a34926 including twins), but there was substantial uncertainty around these estimates.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-9\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Nicotine replacement therapy patches had no enduring, significant effect on smoking in pregnancy; however, 2-year-olds born to women who used NRT were more likely to have survived without any developmental impairment. Further studies should investigate the clinical effectiveness and safety of higher doses of NRT.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-10\">\n                    <jats:title>Trial registration<\/jats:title>\n                    <jats:p>Current Controlled Trials ISRCTN07249128.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs1-11\">\n                    <jats:title>Funding<\/jats:title>\n                    <jats:p>\n                      This project was funded by the NIHR Health Technology Assessment programme and will be published in full in\n                      <jats:italic>Health Technology Assessment<\/jats:italic>\n                      ; Vol. 18, No. 54. See the NIHR Journals Library programme website for further project information.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3310\/hta18540","type":"journal-article","created":{"date-parts":[[2014,9,1]],"date-time":"2014-09-01T06:44:45Z","timestamp":1409553885000},"page":"1-128","update-policy":"https:\/\/doi.org\/10.3310\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":72,"title":["The SNAP trial: a randomised placebo-controlled trial of nicotine replacement therapy in pregnancy \u2013 clinical effectiveness and safety until 2 years after delivery, with economic evaluation"],"prefix":"10.3310","volume":"18","clinical-trial-number":[{"clinical-trial-number":"isrctn07249128","registry":"10.18810\/isrctn","type":"results"}],"author":[{"given":"Sue","family":"Cooper","sequence":"first","affiliation":[{"name":"Division of Primary Care, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah","family":"Lewis","sequence":"additional","affiliation":[{"name":"Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James G","family":"Thornton","sequence":"additional","affiliation":[{"name":"Division of Child Health, Obstetrics and Gynaecology, University of Nottingham, Nottingham, UK"},{"name":"Nottingham Clinical Trials Unit, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Neil","family":"Marlow","sequence":"additional","affiliation":[{"name":"Institute for Women\u2019s Health, University College London, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kim","family":"Watts","sequence":"additional","affiliation":[{"name":"Academic Division of Midwifery, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Britton","sequence":"additional","affiliation":[{"name":"Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew J","family":"Grainge","sequence":"additional","affiliation":[{"name":"Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaspal","family":"Taggar","sequence":"additional","affiliation":[{"name":"Division of Primary Care, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Holly","family":"Essex","sequence":"additional","affiliation":[{"name":"Department of Health Sciences, University of York, York, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steve","family":"Parrott","sequence":"additional","affiliation":[{"name":"Department of Health Sciences, University of York, York, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne","family":"Dickinson","sequence":"additional","affiliation":[{"name":"Division of Primary Care, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel","family":"Whitemore","sequence":"additional","affiliation":[{"name":"Division of Primary Care, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tim","family":"Coleman","sequence":"additional","affiliation":[{"name":"Division of Primary Care, University of Nottingham, Nottingham, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"for the Smoking, Nicotine And Pregnancy (SNAP) Trial Team","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"6221","published-online":{"date-parts":[[2014,8]]},"reference":[{"key":"key2014090111423963_ref1-bib1","volume-title":"Smoking and the Young","author":"","year":"1992"},{"key":"key2014090111423963_ref1-bib2","doi-asserted-by":"publisher","first-page":"626","DOI":"10.1016\/j.ajog.2005.02.106","article-title":"Research agenda for preterm birth: recommendations from the March of Dimes","volume":"193","author":"Green","year":"2005","journal-title":"Am J Obstet Gynecol"},{"key":"key2014090111423963_ref1-bib3","doi-asserted-by":"publisher","first-page":"61","DOI":"10.1056\/NEJMra0708473","article-title":"Effect of in utero and early-life conditions on adult health and disease","volume":"359","author":"Gluckman","year":"2008","journal-title":"New Engl J Med"},{"key":"key2014090111423963_ref1-bib4","unstructured":"The NHS Information Centre. 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