Number of D vacuum has been used since changing bag or emptying the collection chamber:Time:Pt:^Patient:Qn:PhenX
number of d vacuum has been used since changing bag or emptying the collection chamber:time:pt:^patient:qn:phenx
Number of D vacuum has been used since changing bag or emptying the collection chamber:Time:To identify measures at a point in time:^Patient:Quantitative:PhenX
number of d vacuum has been used since changing bag or emptying the collection chamber:time:to identify measures at a point in time:^patient:quantitative:phenx