What is the time cost of exercise? Cost of time spent on exercise in a primary health care intervention to increase physical activity.

When using a single valuation of cost of time spent on exercise in health care interventions, for employed participants 15-30% of net salary should be used. Among unemployed individuals, lower cost estimation should be applied. Better precision in cost estimations can be achieved if participants are stratified by physical activity levels.Trial registration The study was conducted as a survey of existing clinical physical activity on prescription work, and was approved by the Regional Ethical Review Board in Gothenburg, Sweden (ref: 678-14).