[BMJ Publishing Group Ltd Society for Social Medicine and Population Health and International Epidemiology Association European Congress Annual Scientific Meeting 2019, Hosted by the Society for Social Medicine & Population Health and International Epidemiology Association (IEA), School of Public Health, University College Cork, Cork, Ireland, 4–6 September 2019 - ()] Oral Presentations - OP66 Effect of pedometer-based walking interventions on long-term health outcomes: prospective 4-year follow-up of 2 randomised controlled trials using routine primary care data