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Table 3 Effect of pain on QOL at 4 months: changes in SF-12 scores, mental and physical components, for patients with and without CPSP

From: Chronic pain after groin hernia repair: pain characteristics and impact on quality of life

CPSP SF-12 Presurgical 4 mo Difference p valuea
Mean (SD) Mean (SD) Mean (SD)
Yes Physical component 42.81 (9.72) 41.10 (10.68) −1.71 (10.09) 0.266
  Mental component 54.00 (8.58) 50.92 (10.80) −3.08 (8.95) 0.028
Nob Physical component 48.37 (8.45) 48.39 (8.53) 0.03 (9.27) 0.967
  Mental component 55.96 (8.11) 54.22 (9.19) −1.65 (9.34) 0.001
  1. a SF-12 results were compared with the t test for normally distributed paired results when CPSP was present or the Wilcoxon test when CPSP was not present
  2. b Although all patients with CPSP completed the SF-12, the postal response rate for non-CPSP patients was only 30.9%