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This study aimed to assess the impact of a home\u2010based obesity prevention intervention on children's and parents' body mass index (BMI).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The Guelph Family Health Study is a randomised controlled trial of a 6\u2010month obesity prevention intervention aimed at establishing healthful household routines regarding family meals, children's screen time, physical activity and sleep among 285 families with preschool\u2010aged children. The control group received 6 emails on child health behaviours. The analytic sample included 376 children (3.6\u2009\u00b1\u20091.3\u2009years old, 20.2% at risk for overweight, 8.2% with overweight\/obesity) and 481 parents (58.2% with overweight\/obesity).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Compared to controls, the intervention had no significant impact on children's or parents' BMI at post\u2010intervention and 1\u2009year after the intervention. Children in both the intervention and control groups had a non\u2010significant decrease in BMI from baseline to post\u2010intervention [intervention; \u22120.23\u2009kg\/m\n                      <jats:sup>2<\/jats:sup>\n                      (95% CI, \u22120.46, 0.002); control; \u22120.17\u2009kg\/m\n                      <jats:sup>2<\/jats:sup>\n                      (95% CI, \u22120.40, 0.06)] and from baseline to 1\u2010year follow\u2010up [intervention, \u22120.29\u2009kg\/m\n                      <jats:sup>2<\/jats:sup>\n                      (95% CI, \u22120.67, 0.08); control, \u22120.06\u2009kg\/m\n                      <jats:sup>2<\/jats:sup>\n                      (95% CI, \u22120.42, 0.30)].\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Compared to controls, this home\u2010based obesity prevention intervention had no significant impact on children's or parents' BMI immediately after the intervention or after 1\u2009year of follow\u2010up, indicating that the intervention had no additional effect compared to the control group on children's or parents' BMI over time. Future data collection phases will allow for the examination of the intervention effect on BMI as children age.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial Registration<\/jats:title>\n                    <jats:p>\n                      This study is registered at\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/clinicaltrial.gov\">clinicaltrial.gov<\/jats:ext-link>\n                      identifier: NCT02939261\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/ijpo.70062","type":"journal-article","created":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T02:10:55Z","timestamp":1761185455000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Impact of a Home\u2010Based Obesity Prevention Intervention on Children's and Parents'\n                    <scp>BMI<\/scp>\n                    : Findings From the Guelph Family Health Study Randomised Controlled Trial"],"prefix":"10.1111","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6869-7084","authenticated-orcid":false,"given":"Rapha\u00eblle","family":"Jacob","sequence":"first","affiliation":[{"name":"Department of Family Relations and Applied Nutrition University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea C.","family":"Buchholz","sequence":"additional","affiliation":[{"name":"Department of Family Relations and Applied Nutrition University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerarda","family":"Darlington","sequence":"additional","affiliation":[{"name":"Department of Mathematics and Statistics University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alison M.","family":"Duncan","sequence":"additional","affiliation":[{"name":"Department of Human Health Sciences University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3970-9159","authenticated-orcid":false,"given":"Lori Ann","family":"Vallis","sequence":"additional","affiliation":[{"name":"Department of Human Health Sciences University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean\u2010Philippe","family":"Chaput","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Faculty of Medicine University of Ottawa  Ottawa Ontario Canada"},{"name":"Children's Hospital of Eastern Ontario (CHEO) Research Institute  Ottawa Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angela","family":"Annis","sequence":"additional","affiliation":[{"name":"Department of Human Health Sciences University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Madeline","family":"Nixon","sequence":"additional","affiliation":[{"name":"Department of Human Health Sciences University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer D.","family":"Irwin","sequence":"additional","affiliation":[{"name":"School of Health Studies Western University  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Don","family":"Morrow","sequence":"additional","affiliation":[{"name":"School of Health Studies Western University  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David W. 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