Table 3.

Univariate analysis of demographic predictors comparing improved and nonimproved patients for both study sites.

CharacteristicsTWH (WOMAC)HHS (OKS)
Improved, n = 406 (89%)No Improvement, n = 51 (11.2%)pImproved, n = 2398 (88%)No Improvement, n = 322 (11.8%)p
Age, yrs (SD)66.9 (9.7)71.2 (7.2)0.00469.5 (9.3)70.2 (8.7)0.03
Men, n (%)150 (88)20 (12)0.42*862 (86)142 (14)0.006*
Women, n (%)256 (89)31 (11)1536 (90)180 (10)
BMI, kg/m2 (SD)30.2 (6.7)28.7 (5.1)0.732.0 (6.1)31.9 (6.5)0.38
Comorbidity, mean (SD)2.9 (1.7)2.6 (1.6)0.221.5 (1.2)1.5 (1.2)0.66
  • * p value comparing result between men and women with no improvement (chi-square test). TWH: Toronto Western Hospital; HHS: Hamilton Health Sciences Henderson Hospital; BMI: body mass index; OKS: Oxford Knee Score; WOMAC: Western Ontario McMaster University Osteoarthritis Index.