Group a Group b KT 1000 Manual maximum 2.3+/-0.9 2.5+/-1 side to side difference (millimetres-mm) 2.1+/-1.2 2.3+/-1 Based on these values the study was powered to detect a Minimum Clinically Important difference (MCID) of 0.6 mm, which would shift the KT-1000 reading from 3.0 mm (upper bound of satisfactory level) to 3.6 mm (0.6 mm above the satisfactory upper bound).