Walking - long distance - difficulty - score change:ScoreDiff:Pt:^Patient:Qn:OPTIMAL
walking - long distance - difficulty - score change:scorediff:pt:^patient:qn:optimal
Walking - long distance - difficulty - score change:Score Difference:To identify measures at a point in time:^Patient:Quantitative:OPTIMAL
walking - long distance - difficulty - score change:score difference:to identify measures at a point in time:^patient:quantitative:optimal