The overall response rate at the first wave of the DASH study was over 80%. Generally, ethnic minority adolescents were more likely to participate than their White British peers. We are examining the predictors of attrition, the lessons learnt in the DASH study, and the cost-effectiveness of follow-up strategies. We are also examining different statistical methods of addressing attrition.
There was a workshop in June 2006, funded by the MRC's Population Health Sciences Research Network (PHSRN), entitled "Maximising Return from Cohort Studies: Prevention of Attrition and Efficient Analysis". A report on the workshop, along with several presentations, can be found here.
Work has just started on the evaluation of retention strategies in MRC funded cohort studies. This project is funded by the PHSRN and jointly run from the MRC Social and Public Health Sciences Unit (SPHSU) in Glasgow and the MRC Biostatistics Unit (BSU) in Cambridge. More information on this study can be found here.