How often do you experience knee pain:Find:Pt:^Patient:Ord:KOOS
how often do you experience knee pain:find:pt:^patient:ord:koos
How often do you experience knee pain:Finding:To identify measures at a point in time:^Patient:Ordinal:KOOS
how often do you experience knee pain:finding:to identify measures at a point in time:^patient:ordinal:koos