title: Issues of adherence, penetration, and measurement in physical activity effectiveness studies.
authors.forename: D O
authors.initials: DO
authors.lastname: Clark
mesh_terms: D003362:Cost-Benefit Analysis; D004059:Diffusion of Innovation; D005081:Exercise Therapy / Q000191:economics / Q000592:standards* / Q000706:statistics & numerical data; D006293:Health Promotion / Q000191:economics / Q000379:methods / Q000592:standards*; D006801:Humans; D010349:Patient Compliance / Q000523:psychology / Q000706:statistics & numerical data; D019057:Quality-Adjusted Life Years; D012107:Research Design / Q000592:standards*; D012680:Sensitivity and Specificity; D016896:Treatment Outcome