Skip to main content

Table 5 SF 12-MCS 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-MCS

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

55.94

50.27,61.61

< 0.001

53.37

38.98,67.76

< 0.001

55.51

50.31,60.72

< 0.001

Time (3-months post-surgery)

2.31

−4.84,9.46

0.527

−7.95

−20.26,4.35

0.205

4.34

−4.19,12.87

0.319

Age ≥ 65 years

3.61

−0.63,7.85

0.095

4.95

−1.94,11.85

0.159

3.64

−1.44,8.71

0.160

Time*Age ≥ 65 years

−2.83

−7.73,2.07

0.258

−2.39

−9.31,4.52

0.498

−2.82

−9.07,3.43

0.376

Female sex

−3.10

−6.67,0.47

0.089

1.87

−5.27,9.00

0.608

−4.88

−9.13,-0.63

0.024

Time*Female sex

−3.39

−7.44,0.65

0.100

−3.93

−11.33,3.48

0.299

−2.16

−7.28,2.96

0.409

Low education

−5.35

−8.52,-2.18

0.001

−5.49

−10.60,-0.38

0.035

−6.59

−10.81,-2.36

0.002

Time*Low education

4.32

0.36,8.28

0.033

5.00

−0.49,10.48

0.074

5.80

0.31,11.29

0.038

BMI ≥ 30 kg/m2

0.93

−2.41,4.27

0.586

− 2.22

−7.03,2.58

0.364

1.90

−2.25,6.04

0.369

Time*BMI ≥30 kg/m2

1.16

−3.11,5.43

0.596

4.59

−2.08,11.25

0.177

0.97

−4.60,6.53

0.734

Depressive symptoms

−12.41

−16.51,-8.31

< 0.001

−14.51

−20.71,-8.31

< 0.001

− 10.23

− 15.99,-4.47

0.001

Time*Depressive symptoms

3.22

−1.91,8.36

0.219

−0.13

−7.62,7.37

0.974

3.16

−3.80,10.11

0.374

Cognitive impairment

3.86

−2.33,10.05

0.222

11.61

4.03,19.20

0.003

0.73

−6.76,8.22

0.849

Time*Cognitive impairment

0.03

−5.73,5.80

0.992

−4.64

−13.82,4.54

0.322

1.18

−6.16,8.51

0.753

Comorbidity ≥ 4 diseases

−3.45

−6.83,-0.07

0.045

−7.02

−13.43,-0.61

0.032

−0.89

−5.26,3.48

0.690

Time*Comorbidity ≥4 diseases

0.35

−3.43,4.13

0.856

6.78

0.23,13.32

0.042

−2.48

−7.58,2.62

0.340

Current smoker

−1.02

−5.84,3.80

0.678

3.13

−2.19,8.46

0.249

−1.46

−7.99,5.07

0.662

Time*Current smoker

1.52

−4.86,7.91

0.640

−4.70

−12.15,2.75

0.217

3.82

−4.15,11.79

0.347

Current alcohol user

−0.68

−4.55,3.19

0.731

0.30

−7.68,8.28

0.941

−0.36

−4.70,3.98

0.871

Time*Current alcohol user

2.10

−2.69,6.89

0.390

9.09

4.47,13.70

< 0.001

−0.08

−5.85,5.68

0.978

TKA surgery

0.88

−2.54,4.30

0.614

0.84

−5.12,6.79

0.783

1.58

−2.45,5.62

0.442

Time*TKA surgery

−3.01

−6.93,0.90

0.132

−2.70

−8.72,3.32

0.380

− 3.95

−9.03,1.13

0.128

  1. Abbreviation: β, coefficient regression, CI confidence intervals, SF-12 Short-Form General Health Survey, MCS mental component scores, BMI Body Mass Index, TKA total knee arthroplasty (reference UKA, unicompartmental knee arthroplasty)
  2. SF 12-MCS ranges from 0 [worst] to 100 [best]