The approach to retention and the Wave 2 interim visit that had a high recontact rate were labor intensive but useful as strategies for retention. Wave 3 examinations started in July 2009. Evaluation of the success of the retention strategy is incomplete, but data from the first three neighborhoods to be revisited are promising. Thus far, our return rate is 67.5% after the first nine months in the field for the first physical reexamination (Wave 3).
