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This study prospectively evaluated the associations between GWG during the second and third trimesters of pregnancy and adverse pregnancy outcomes in an urban Tanzanian pregnancy cohort.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We used data from a randomized clinical trial conducted among pregnant women recruited by 27\u00a0weeks of gestation in Dar es Salaam, Tanzania (N\u2009=\u20091230). Women\u2019s gestational weight was measured at baseline and at monthly antenatal visits. Weekly GWG rate during the second and third trimesters was calculated and characterized as inadequate, adequate, or excessive, in conjunction with measured or imputed early-pregnancy BMI status according to the 2009 Institute of Medicine (IOM) GWG guidelines. We used multivariable Poisson regression with a sandwich variance estimator to calculate risk ratios (RR) for associations of GWG with low birth weight, preterm birth, small for gestational age (SGA), and large for gestational age (LGA). Degree of appropriate GWG defined using additional metrics (i.e., percentage of adequacy, z-score) and potential effect modification by maternal BMI were additionally evaluated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>According to the IOM guidelines, 517 (42.0%), 270 (22.0%), and 443 (36.0%) women were characterized as having inadequate, adequate, and excessive GWG, respectively. Overall, compared to women with adequate GWG, women with inadequate GWG had a lower risk of LGA births (RR\u2009=\u20090.54, 95% CI: 0.36\u20130.80) and a higher risk of SGA births (RR\u2009=\u20091.32, 95% CI: 0.95\u20131.81). Women with inadequate GWG as defined by percentage of GWG adequacy had a higher risk of LBW (OR\u2009=\u20091.93, 95% CI: 1.03\u20133.63). In stratified analyses by early-pregnancy BMI, excessive GWG among women with normal BMI was associated with a higher risk of preterm birth (RR\u2009=\u20091.59, 95% CI: 1.03\u20132.44).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>A comparatively high percentage of excessive GWG was observed among healthy pregnant women in Tanzania. Both inadequate and excessive GWGs were associated with elevated risks of poor pregnancy outcomes. Future studies among diverse SSA populations are warranted to confirm our findings, and clinical recommendations on optimal GWG should be developed to promote healthy GWG in SSA settings.<\/jats:p><jats:p><jats:italic>Trial registration:<\/jats:italic>This trial was registered as \u201cPrenatal Iron Supplements: Safety and Efficacy in Tanzania\u201d (NCT01119612;<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/clinicaltrials.gov\/show\/NCT01119612\">http:\/\/clinicaltrials.gov\/show\/NCT01119612<\/jats:ext-link>).<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12978-022-01441-7","type":"journal-article","created":{"date-parts":[[2022,6,16]],"date-time":"2022-06-16T13:05:52Z","timestamp":1655384752000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Gestational weight gain during the second and third trimesters and adverse pregnancy outcomes, results from a prospective pregnancy cohort in urban Tanzania"],"prefix":"10.1186","volume":"19","clinical-trial-number":[{"clinical-trial-number":"nct01119612","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4497-9615","authenticated-orcid":false,"given":"Jiaxi","family":"Yang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Molin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deirdre K.","family":"Tobias","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janet W.","family":"Rich-Edwards","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne Marie","family":"Darling","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ajibola I.","family":"Abioye","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea B.","family":"Pembe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isabel","family":"Madzorera","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wafaie W.","family":"Fawzi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,6,16]]},"reference":[{"key":"1441_CR1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.m1007","volume":"369","author":"LG Kvalvik","year":"2020","unstructured":"Kvalvik LG, Wilcox AJ, Skj\u00e6rven R, \u00d8stbye T, Harmon QE. 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