::::Actually I misread the table initially. The 13 prospective studies have, on average, a sample of 3,374, compared with 2,176 for the retrospective. So the latter are actually, on average, about 2/3 the size of the former. [[User:Murray|Murray]] 21:03, 22 March 2008 (EDT) | ::::Actually I misread the table initially. The 13 prospective studies have, on average, a sample of 3,374, compared with 2,176 for the retrospective. So the latter are actually, on average, about 2/3 the size of the former. [[User:Murray|Murray]] 21:03, 22 March 2008 (EDT) |