ISRCTN62025354.

Methods	Study design: RCT Duration: 13 weeks Location: GP practices in Manchester, UK
Participants	Population: adults with depression, COPD, T2DM, arthritis or coronary heart disease Baseline characteristics: NR Inclusion criteria: people attending primary care aged ≥ 50 years, ≥ 2 of 5 common conditions, fluent in written English Exclusion criteria: unable to consent, or considered unsuitable by the primary care team
Interventions	Treatment arms Self‐affirmation task + health message Health message only control group
Outcomes	Recruitment, retention, characteristics of responders vs non‐responders, engagement with intervention (intervention group only), number of negative comments made about the experience of the intervention (intervention group only) and participation (both groups), number of questionnaires completed correctly
Notes	Funding: NIHR Greater Manchester Primary Care Patient Safety Translational Research Centre (GM PSTRC) Identifiers: MINIMA; ISRCTN62025354