TY - JOUR T1 - What is the “golden standard” for assessing population-based interventions?—problems of dilution bias JF - Journal of Epidemiology and Community Health JO - J Epidemiol Community Health SP - 617 LP - 622 DO - 10.1136/jech.54.8.617 VL - 54 IS - 8 AU - L Lindholm AU - M Rosén Y1 - 2000/08/01 UR - http://jech.bmj.com/content/54/8/617.abstract N2 - OBJECTIVES To identify different types of dilution bias in population-based interventions and to suggest measures for handling these methodological problems. DESIGN Literature review plus analysis of data from a population-based intervention against cardiovascular disease in a Swedish municipality. MAIN RESULTS The effects of an intervention on mortality and morbidity were much more diluted by non-intervening factors, dissemination to areas outside the intervention area, social diffusion, population mobility and time than by using intermediate outcome measures. CONCLUSIONS Theoretically, changes in scientifically well documented risk factors, for example, intermediate outcome measures, should be preferred to using morbidity or mortality as outcome measures. ER -