Then delete anyone from the study who died before 50

Then delete anyone from the study who died before 50

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送交者: HunHunSheng 于 2008-11-04, 13:26:02:

回答: the fact that the 2nd group are survivors of more years than the 1st group. 由 chouqilozi 于 2008-11-04, 13:18:29:

yes, this is fine, I overlooked that they are identical twins. (无内容) - chouqilozi (0 bytes) 2008-11-04, 13:31:20 (271489)
Or consider those in 2nd group who died before 40 - HunHunSheng (52 bytes) 2008-11-04, 13:27:26 (271487)