Table 4.
SF 12-PCS and associated patients’ characteristics and clinical conditions: multivariable generalised estimating equation models
| 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 |
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)
SF 12-PCS ranges from 0 [worst] to 100 [best]