The top panel represents survivors and the bottom panel represents non-cancer controls. The percent consenting and refusing was calculated among those alive and eligible at each time point; participants become ineligible if they develop another cancer, or any cancer if a control, neurological disease, or, for survivors, have a recurrence. Numbers at 36-months drop due to administrative loss from a gap in funding. Participants may have refused one interview, but completed later interviews. Sixty-nine percent of participants completed three or four assessments, 15.2% completed two, and 16.3% completed baseline only. There were no significant differences in age, race, or education by number of completed assessments.