How many Hs per D were you exposed:NRat:Pt:^Patient:Ord:PhenX
how many hs per d were you exposed:nrat:pt:^patient:ord:phenx
How many Hs per D were you exposed:Number=Count/Time:To identify measures at a point in time:^Patient:Ordinal:PhenX
how many hs per d were you exposed:number=count/time:to identify measures at a point in time:^patient:ordinal:phenx