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Table 4 Results for primary outcomes based on WOMAC and SF-36: preintervention (baseline), postintervention (8 weeks) and 6 monthsa

From: A randomised controlled trial of a self-management education program for osteoarthritis of the knee delivered by health care professionals

Variables OAK and control preinterventionb OAK Control Difference in changes between groups
   8 weeks 6 months 8 weeks 6 months Preintervention to 8 weeks 95% CI Preintervention to 6 months 95% CI
WOMAC          
   Painc 7.1 (0) 5.5 (0.3) 6.1 (0.3) 7.0 (0.3) 6.7 (0.3) -1.46 -2.18 to -0.73 -0.49 -1.26 to 0.28
   Stiffness 3.6 (0) 3.1 (0.2) 3.1 (0.2) 3.6 (0.1) 3.4 (0.2) -0.50 -0.91 to -0.08 -0.29 -0.73 to 0.15
   Physical Functionc 24.1 (0) 19.1 (0.7) 19.9 (1) 24.4 (0.7) 23.4 (0.9) -5.55 -7.38 to -3.31 -4.35 -6.20 to -0.91
   Totalc 34.9 (0) 27.7 (1.0) 29.2 (1.2) 34.9 (1) 33.3 (1.2) -7.23 -9.98 to -4.49 -4.08 -7.47 to -0.68
SF-36 (0 to 100)          
   Physical Functionc 48.0 (0) 54.1 (1.4) 54.2 (1.9) 48.5 (1.4) 48.5 (1.9) 5.61 1.84 to 9.37 5.67 0.40 to 10.93
   Role Physicalc 35.7 (0) 47.9 (4.0) 46.0 (4.8) 30.8 (4.0) 38.6 (4.8) 17.06 5.90 to 28.21 7.37 -5.93 to 20.67
   Body Painc 46.3 (0) 51.2 (1.9) 50.8 (2.1) 44.0 (1.9) 44.8 (2.2) 7.19 1.93 to 12.44 6.06 0.04 to 12.07
   General Health 65.8 (0) 69.2 (1.3) 69.6 (1.7) 67.1 (1.3) 66.0 (1.7) 2.11 -1.45 to 5.67 3.59 -1.19 to 8.37
   Vitalityc 54.7 (0) 59.0 (1.5) 60.7 (1.7) 53.0 (1.5) 56.0 (1.8) 6.02 1.87 to 10.16 4.72 -0.11 to 9.55
   Social Functionc 73.8 (0) 83.0 (2.2) 77.8 (2.6) 72.3 (2.1) 72.7 (2.6) 10.72 4.81 to 16.62 4.07 -2.08 to 12.22
   Role Emotional 61.7 (0) 73.7 (3.9) 70.8 (4.5) 68.5 (3.9) 69.4 (4.5) 5.18 -5.64 to 16.00 1.35 -11.06 to13.76
   Mental Health 75.8 (0) 77.0 (1.3) 78.5 (1.5) 74.9 (1.3) 74.7 (1.5) 2.08 -1.42 to 5.58 3.85 -0.21 to 7.91
  1. aOAK: Osteoarthritis of the Knee Self-Management Program. SF-36: Short Form 36 version 1 questionnaire; WOMAC: Western Ontario and McMaster Universities Arthritis Index. bPreintervention values were the same in both groups when the baseline value was used as a covariate. Values were calculated using repeated-measures analysis of covariance with the baseline value of the dependent variable as the covariate. Data are estimated marginal means (SEM) with the mean (95% CI) differences in changes between the groups at each time point. cP < 0.05 for baseline to 6 months.