Protocol for a feasibility randomised controlled study of a multicomponent intervention to promote a sustainable return to work of workers on long-term sick leave - PROWORK: PROmoting a Sustainable and Healthy Return to WORK

Background: The cost of sickness absence has major social, psychological and financial implications for individuals and organisations. Return-to-work (RTW) interventions that support good quality communication and contact with the workplace can reduce the length of sickness absence by between 15 and 30 days. However, initiatives promoting a sustainable return to work for workers with poor mental health on long-term sickness absence across small, medium and large enterprises (SMEs and LEs) are limited. This paper describes the protocol of a pilot randomised controlled trial (RCT) to test the feasibility of implementing a RTW intervention across SMEs and LEs across all sectors.

Methods and design: A two-arm feasibility RCT with a 4-month intervention will be conducted in SMEs and LE enterprises from the Midlands region, UK. At least 8 organisations (4 controls and interventions), and at least 60 workers and/or managers, will be recruited and randomised into the intervention and control group (30 interventions, 30 controls). Workers on long-term sickness absence (LTSA) (between 8 and 50 days) and managers with a worker on LTSA will be eligible to participate. The intervention is a behavioural change programme, including a managers and workers RTW toolkit, focused on supporting sickness absence and RTW through the provision of knowledge, problem-solving, action planning, goal setting and positive communication that leads to a sustainable RTW. Organisations assigned to the control group will continue with their usual practice. Measurements of mental health, RTW, work outcomes, quality-of-life, workplace support and communication and other demographic data will be taken at baseline, 2 months and 4 months. Feasibility will be assessed based on recruitment, retention, attrition, completion of measures and intervention compliance for which specific process and research outcomes have been established. A process evaluation will explore the experiences and acceptability of the intervention components and evaluation measures. Exploratory economic evaluation will be conducted to further inform a definitive trial.

Discussion: This is a novel intervention using a worker-manager approach to promote a sustainable return to work of workers on long-term sick leave due to poor mental wellbeing. If this intervention is shown to be feasible, the outcomes will inform a larger scale randomised control trial.

Trial registration: ISRCTN90032009 (retrospectively registered, date registered 15th December 2020)