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Table 3 Effect sizes from baseline to 6 weeks (n = 22) and relative efficiency

From: The feasibility of implementing the ICHOM Standard Set for Hip and Knee Osteoarthritis: a mixed-methods evaluation in public and private hospital settings

Instrument Mean changea (95%CI) p Effect size Relative efficiencyb Relative efficiency rank
Pain - right knee −2.67 (−4.10 to −1.23) < 0.01 0.79 (medium) 1.00 1
Pain - left knee −1.78 (− 2.84 to −0.72) < 0.01 0.51 (medium) 0.82 2
EQ-5D index 0.23 (0.07 to 0.39) 0.01 0.85 (large) 0.59 3
Pain - lower back −1.89 (−3.25 to −0.53) 0.01 0.77 (medium) 0.56 4
KOOS physical functionc −9.87 (−19.19 to −0.55) 0.04 0.74 (medium) 0.35 5
Pain - right hip −1.17 (−2.83 to 0.50) 0.16 0.39 (small) 0.14 6
EQ-5D VAS 5.53 (−4.52 to 15.57) 0.26 0.26 (small) 0.09 7
Pain - left hip −0.44 (−1.78 to 0.89) 0.49 0.19 (small) 0.03 8
  1. aMean change = 6-week post-operative score minus baseline score; positive change represents improvement for the EQ-5D index and EQ-5D VAS; negative change represents improvement for pain scores, and KOOS-PS score; p < 0.05 indicates a statistically significant change
  2. bRelative efficiency < 1.00 indicates that the instrument is less efficient than the ‘Pain - right knee’ score in detecting change after joint replacement surgery
  3. cKOOS physical function scores collected from knee participants only; HOOS physical function scores are not reported as too few hip participants completed both baseline and 6 week questionnaires (n = 3)