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Table 3 Responsiveness of power grip (effect sizes)

From: Power grip, pinch grip, manual muscle testing or thenar atrophy – which should be assessed as a motor outcome after carpal tunnel decompression? A systematic review

Power grip Nakamichi & Tachibana 1997 [17] Dias et al 2004 [29]
  CG EG CG EG
Mean pre-op/post-op at 6 weeks (kgs) 23.6/16.5 24.2/19.10 17.8/18.5 18.7/17.8
Effect size 1.69* 0.85* 0.06 0.08
Mean pre-op/post-op at 12 weeks 23.6/19.4 24.2/21.6 17.8/20.5 18.7/20.7
Effect size 1.00* 0.43* 0.22 0.18
  1. CG = comparator group, EG = experimental group
  2. * large effect size but change reflects a decrease in strength