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Table 2 Sample size scenarios

From: Total or Partial Knee Arthroplasty Trial - TOPKAT: study protocol for a randomised controlled trial

Number in each group Mean difference in OKS
2.0 3.0 4.0
Power SD 1% sig level 5% sig level 1% sig level 5% sig level 1% sig level 5% sig level
90 8.0 480 340 215 150 120 85
  9.0 600 430 270 190 150 110
  10.0 740 520 330 235 190 130
80 8.0 375 250 170 110 100 60
  9.0 470 320 210 140 120 80
  10.0 590 390 260 175 150 100