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Table 1 Patient number required for MCID in Harris Hip Score at different power levels.

From: A randomised controlled trial of total hip arthroplasty versus resurfacing arthroplasty in the treatment of young patients with arthritis of the hip joint

  MCID = 7 MCID = 10
Power 80% 90% 80% 90%
SD     
13 55 73 28 37
15 73 97 36 48
  1. MCID: Minimum clinically important difference