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Many individuals living with bipolar disorder are parents. Due to the nature of the condition, parents with BD often experience challenges in delivering consistent parenting. In addition, up to 60% of their children experience at least one mental health problem in childhood and are at increased risk of future severe mental health problems including bipolar disorder. This paper describes the rationale and protocol for a definitive randomised controlled trial of a new digital intervention (Integrated Bipolar Parenting Intervention; IBPI) to support effective parenting in the context of BD.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods and design<\/jats:title>\n            <jats:p>The randomised controlled clinical and cost-effectiveness trial compares IBPI plus treatment as usual (TAU) with TAU alone. Parents with BD with a child aged 4\u201311 years old and living in the UK will be recruited through the NHS, mental health charities, and social media. Participants will be screened to confirm a clinical diagnosis of BD. They will then complete baseline assessments and be randomised to receive either IBPI\u2009+\u2009TAU or TAU with follow up assessments after 24 and 48 weeks. The primary clinical outcome is child emotional and behaviour problems measured by the Strengths and Difficulties Questionnaire at 24 weeks. The primary economic evaluation will be a cost-utility analysis at 24-weeks with quality-adjusted life years (QALYs) measured using the Child Health Utility 9 Dimensions measure of health-related quality of life. Secondary outcomes include parental mood and confidence and family functioning at 24 and 48 weeks, and child emotional and behavioural problems and health economic outcomes at 48 weeks.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Discussion<\/jats:title>\n            <jats:p>Despite the challenges faced by children of parents with BD and the parents themselves, research on how to improve their lives is lacking. This will be the first definitive trial of a tailored intervention that aims to improve child and parent outcomes. Results will be reported in line with CONSORT guidance for clinical and health economic findings.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Trial registration<\/jats:title>\n            <jats:p>ISRCTN Registry (ISRCTN15962574) registered on 03\/05\/2023.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/s12888-025-07214-3","type":"journal-article","created":{"date-parts":[[2025,8,26]],"date-time":"2025-08-26T09:45:58Z","timestamp":1756201558000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A randomised controlled clinical and cost effectiveness trial of an online integrated bipolar parenting intervention (IBPI) compared to treatment as usual in improving child emotional and behavioural outcomes: a study protocol"],"prefix":"10.1186","volume":"25","author":[{"given":"Steven H.","family":"Jones","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah","family":"Byford","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth","family":"Coleman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cathy","family":"Creswell","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lucy","family":"Cryle","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne","family":"Duffy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephanie","family":"Fortier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Catherine E.","family":"Hewitt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fiona","family":"Lobban","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher","family":"Lodge","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Morriss","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jasper","family":"Palmier-Claus","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lesley","family":"Sinclair","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher J.","family":"Sutton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Judith","family":"Watson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nahel","family":"Yaziji","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eirian","family":"Kerry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,8,26]]},"reference":[{"key":"7214_CR1","volume-title":"Manic-depressive illness","author":"FK Goodwin","year":"2007","unstructured":"Goodwin FK, Jamison K. 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The article has been updated to rectify the errors.","order":6,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"NHS ethical approval was obtained from West Midlands \u2013 Solihull Research Ethics Committee (REC ID: 309190). Every participant is required to provide informed consent to take part in the study. Participants are provided indemnity coverage for negligent harm through the standard NHS indemnity arrangements, while Lancaster University\u2019s insurance extends to cover non-negligent harm associated with the protocol.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"Members of the research team were involved in the development and feasibility testing of the original IBPI intervention ([]; SJ & FL). The current study team were involved in the update of the IBPI intervention for the current study, therefore this is not an independent evaluation. CC receives funding from the Oxford Health NIHR Biomedical Research Centres (BRC) and the Oxford and Thames Valley NIHR Applied Research Collaborations (ARC); the views expressed are the authors and not those of the NIHR BRC or NIHR ARC. No other competing interests were reported from the team.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"This research is sponsored by Lancaster University Sponsorship Committee (Lancaster University, Bailrigg, Lancaster, LA1 4YW; Sponsorship@lancaster.ac.uk).","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Sponsorship"}},{"value":"Not a commissioned study; independently peer reviewed for competitive NIHR national funding.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Provenance and peer review"}}],"article-number":"816"}}