Childs age at reference date:Time:Pt:^Patient:Qn:PhenX
childs age at reference date:time:pt:^patient:qn:phenx
Childs age at reference date:Time:To identify measures at a point in time:^Patient:Quantitative:PhenX
childs age at reference date:time:to identify measures at a point in time:^patient:quantitative:phenx