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Table 4 Responsiveness of key and tip pinch 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

  Key pinch Tip pinch
  Nakamichi & Tachibana 1997 [17] Dias et al 2004 [29]
  CG EG CG EG
Mean pre-op/post-op at 6 weeks (kgs) 3.74/2.58 3.84/3.10 4.9/6.1 5.7/6.0
Effect size 1.02* 0.64* 0.46 0.14
Mean pre-op/post-op at 12 weeks 3.74/2.91 3.84/3.48 4.9/6.4 5.7/6.4
Effect size 0.73* 0.31* 0.58 0.33
  1. CG = comparator group, EG = experimental group
  2. * large effect size but change reflects a decrease in strength