About how long has it been since you last visited a dentist:Time:Pt:^Patient:Qn:PhenX
about how long has it been since you last visited a dentist:time:pt:^patient:qn:phenx
About how long has it been since you last visited a dentist:Time:To identify measures at a point in time:^Patient:Quantitative:PhenX
about how long has it been since you last visited a dentist:time:to identify measures at a point in time:^patient:quantitative:phenx