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Participants who fulfil the study\u2019s eligibility criteria will be randomly assigned either to an iACT intervention group (n=200) or to a wait-list control group (n=200). Participants in the intervention groups will be asked to complete the programme within 12 weeks of the baseline survey. The intervention programme contains eight modules based on ACT. Primary outcomes are six components of psychological well-being, based on Ryff\u2019s theory. Secondary outcomes are intention to leave their job, work engagement, work performance, sick leave days, psychological distress, euthymia, positive emotions, job and life satisfaction, social support and parental burn-out.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Ethics and dissemination<\/jats:title>\n                  <jats:p>Ethical approval for this study has been obtained from the Research Ethics Review Board of Graduate School of Medicine, the University of Tokyo (No. 2019134NI). If the intervention programmes are found to be significantly beneficial, the programmes can be made available for all working mothers with preschool children in Japan.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Discussion<\/jats:title>\n                  <jats:p>This study will contribute to the development of an internet-based self-care programme that is effective, feasible, low cost and accessible to improve the well-being of working mothers.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Trial registration number<\/jats:title>\n                  <jats:p>UMIN000039918.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/bmjopen-2020-042167","type":"journal-article","created":{"date-parts":[[2021,2,26]],"date-time":"2021-02-26T11:09:06Z","timestamp":1614337746000},"page":"e042167","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["Internet-based acceptance and commitment therapy programme \u2018Happiness Mom\u2019 for well-being: a protocol for a randomised controlled trial"],"prefix":"10.1136","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6097-5948","authenticated-orcid":false,"given":"Natsu","family":"Sasaki","sequence":"first","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2584-0666","authenticated-orcid":false,"given":"Kotaro","family":"Imamura","sequence":"additional","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9349-3294","authenticated-orcid":false,"given":"Daisuke","family":"Nishi","sequence":"additional","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuhiro","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4529-6119","authenticated-orcid":false,"given":"Yuki","family":"Sekiya","sequence":"additional","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9399-6596","authenticated-orcid":false,"given":"Kanami","family":"Tsuno","sequence":"additional","affiliation":[{"name":"School of Health Innovation, Kanagawa University of Human Services, Kanagawa, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuka","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1080-2720","authenticated-orcid":false,"given":"Norito","family":"Kawakami","sequence":"additional","affiliation":[{"name":"Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2021,2,26]]},"reference":[{"key":"2025101812385608000_11.2.e042167.1","unstructured":"Ortiz-Ospina E , Tzvetkova S . 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