Table 2

Cost and effect outcomes

Surgery*Non-operative*Incremental difference†
WOMAC
 Baseline1222.91 (478.16)1355.26 (548.92)−132.35 (−24.58 to 289.29), 0.10
 24-month1526.45 (623.83)1510.77 (570.21)15.69 (−198.35 to 166.98), 0.87
Utility
 Baseline0.79 (0.22)0.80 (0.21)0.01 (−0.06 to 0.07), 0.85
 24-month0.84 (0.23)0.86 (0.16)0.02 (−0.04 to 0.08), 0.47
QALY1.64 (0.40)1.66 (0.30)−0.02 (−0.09 to 0.13), 0.72
Cost‡
 Healthcare payer perspective2633.25 (574.43)737.40 (542.93)1895.85 (1716.13 to 2075.57), <0.01
 Societal perspective3825.60 (1443.48)1614.22 (1784.94)2211.38 (1716.04 to 2706.51), <0.01
  • *Mean (SD).

  • †Mean difference between groups (95% CI), p value.

  • ‡2014 Canadian dollars.

  • QALY, quality-adjusted life year; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.