Longitudinal research: methods for maximizing subject follow-up

Early intervention for hazardous alcohol use has been shown repeatedly to b e effective in reducing alcohol consumption, limiting alcohol-related probl ems and improving biochemical parameters. However, in most studies the foll ow-up period has been 2 years or less. The current paper presents progress on a 10-year follow-up of a randomized controlled trial of early interventi on. Methods used for tracing subjects and ensuring minimal refusals are det ailed. The intensity of effort required to locate subjects is documented an d recommendations for ensuring good follow-up rates are made. At completion of follow-up, 72.5% of the sample reviewed here and 78.2% of the total coh ort had been traced. Our experiences demonstrate that long-term follow-up i s feasible, given sufficient planning and persistence.