What is your best estimate of the number of D you smoked part or all of a cigarette during the past 30D:NRat:30D:^Patient:Qn:PhenX
what is your best estimate of the number of d you smoked part or all of a cigarette during the past 30d:nrat:30d:^patient:qn:phenx
30D freq estimate nRate PhenX
30d freq estimate nrate phenx