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Table 4 SF 12-PCS and associated patients’ characteristics and clinical conditions: multivariable generalised estimating equation models

From: Quality of life outcomes in patients undergoing knee replacement surgery: longitudinal findings from the QPro-Gin study

SF 12-PCS Total (n = 132) Rehabilitation program after discharge
Yes (n = 40) No (n = 92)
β 95%CI P β 95%CI P β 95%CI P
Intercept 40.41 34.77,46.04 < 0.001 43.01 31.41,54.61 < 0.001 39.29 32.84,45.74 < 0.001
Time (3-months post-surgery) 7.09 −0.26,14.45 0.059 0.36 −16.46,17.18 0.967 9.99 1.43,18.55 0.022
Age ≥ 65 year 3.02 −0.63,6.66 0.105 5.88 −0.31,12.08 0.063 1.60 −2.71,5.92 0.467
Time*Age ≥ 65 year −5.21 −9.69,-0.74 0.022 −12.18 −19.79,-4.57 0.002 −1.92 −7.05,3.21 0.463
Female sex −2.96 −6.38,0.46 0.090 −4.83 −11.65,2.00 0.166 −2.13 −6.29,2.02 0.314
Time*Female sex −1.24 −5.72,3.23 0.586 0.18 −10.49,10.86 0.973 −1.87 −6.92,3.17 0.467
Low education −0.51 −4.23,3.20 0.786 −1.58 −7.01,3.85 0.568 −0.31 −4.75,4.14 0.892
Time*Low education −0.93 −5.64,3.78 0.698 1.44 −5.89,8.77 0.701 −2.91 −7.93,2.11 0.256
BMI ≥ 30 kg/m2 −4.96 −8.27,-1.65 0.003 −6.03 −13.14,1.09 0.097 −5.85 −9.61,-2.10 0.002
Time*BMI ≥30 kg/m2 4.85 0.96,8.73 0.015 7.66 −2.72,18.03 0.148 5.52 1.10,9.94 0.014
Depressive symptoms −4.34 −7.60,-1.08 0.009 −6.37 −12.41,-0.32 0.039 −3.34 −7.24,0.56 0.093
Time*Depressive symptoms −1.85 −6.03,2.33 0.386 1.57 −6.24,9.38 0.694 −3.00 −7.48,1.48 0.190
Cognitive impairment 1.89 −2.01,5.78 0.343 −2.01 −10.74,6.71 0.651 1.94 −2.84,6.73 0.426
Time*Cognitive impairment 3.30 −2.16,8.76 0.236 13.03 −6.37,32.43 0.188 2.65 −2.79,8.09 0.339
Comorbidity ≥ 4 diseases − 2.13 −5.08,0.82 0.157 −3.42 −9.63,2.80 0.281 −1.97 −5.53,1.59 0.278
Time*Comorbidity ≥4 diseases 4.86 0.64,9.09 0.024 11.24 3.45,19.02 0.005 3.39 −1.40,8.17 0.166
Current smoker 2.12 −2.00,6.24 0.313 11.01 1.56,20.46 0.022 −0.47 −4.73,3.79 0.829
Time*Current smoker −3.01 −7.46,1.43 0.184 −16.04 −24.00,-8.08 < 0.001 −0.53 −4.88,3.82 0.810
Current alcohol user 1.14 −2.29,4.57 0.514 1.59 −4.74,7.92 0.622 2.28 −1.79,6.36 0.273
Time*Current alcohol user −4.34 −9.09,0.41 0.073 −3.39 −12.40,5.63 0.462 −5.83 −11.09,-0.56 0.030
TKA surgery −2.53 −5.58,0.52 0.104 −6.03 −11.65,-0.41 0.036 −1.13 −4.66,2.39 0.529
Time*TKA surgery 1.93 −1.62,5.49 0.287 4.55 −1.64,10.75 0.150 1.06 −3.00,5.11 0.609
  1. Abbreviation: β, coefficient regression, CI confidence intervals, SF-12 Short-Form General Health Survey, PCS physical component scores, BMI Body Mass Index, TKA total knee arthroplasty (reference UKA, unicompartmental knee arthroplasty)
  2. SF 12-PCS ranges from 0 [worst] to 100 [best]