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Table 2 Baseline distribution of sf-12 and womac-index according to patients’ characteristics

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

  (n = 132) SF 12-PCS SF 12-MCS WOMAC-Index
N (%) Mean ± SD P Mean ± SD P Mean ± SD P
Age    0.318   0.900   0.925
 < 65 years 42 (31.8) 34.4 ± 9.3   48.2 ± 12.4   45.9 ± 14.9  
 ≥ 65 years 90 (68.2) 36.1 ± 8.8   48.0 ± 10.5   45.6 ± 16.6  
Sex    0.040   0.002   < 0.001
 Male 35 (26.5) 38.2 ± 9.4   53.0 ± 10.8   37.4 ± 14.3  
 Female 97 (73.5) 34.6 ± 8.7   46.3 ± 10.7   48.7 ± 15.6  
Education    0.159   0.001   0.009
 Low 86 (65.2) 34.8 ± 8.8   45.8 ± 11.3   48.4 ± 16.0  
 High 46 (34.8) 37.1 ± 9.3   52.3 ± 9.4   40.7 ± 14.9  
BMI    0.001   0.635   0.074
 < 30 kg/m2 87 (65.9) 37.4 ± 8.5   48.4 ± 11.1   43.9 ± 16.0  
 ≥ 30 kg/m2 45 (34.1) 31.9 ± 8.8   47.4 ± 11.3   49.2 ± 15.6  
Depressive symptoms (GDS ≥ 6)    0.005   < 0.001   < 0.001
 No 102 (77.3) 36.6 ± 9.2   51.1 ± 9.3   42.7 ± 14.9  
 Yes 30 (22.7) 31.9 ± 7.3   37.7 ± 10.7   55.8 ± 15.7  
Cognitive impairment (MMSE < 24)    0.883   0.663   0.529
 No 121 (91.7) 35.5 ± 9.2   48.2 ± 10.8   45.4 ± 16.1  
 Yes 11 (8.3) 35.9 ± 5.9   46.6 ± 14.7   48.6 ± 14.8  
Comorbidity    0.191   0.033   0.699
 < 4 diseases 44 (33.3) 37.0 ± 8.9   51.0 ± 10.4   46.5 ± 17.9  
 ≥ 4 diseases 88 (66.7) 34.0.8 ± 9   46.6 ± 11.2   45.3 ± 15.1  
Current smoker    0.387   0.828   0.400
 No 115 (87.1) 35.3 ± 9.1   48.1 ± 10.7   46.2 ± 15.9  
 Yes 17 (12.9) 37.3 ± 7.7   47.5 ± 13.7   42.6 ± 16.6  
Current alcohol user    0.097   0.101   0.005
 No 27 (20.5) 33.0 ± 8.0   44.9 ± 10.6   52.1 ± 11.5  
 Yes 105 (79.5) 36.2 ± 9.1   48.9 ± 11.1   44.1 ± 16.6  
Surgery type    0.574   0.159   0.016
 UKA 47 (35.6) 36.2 ± 8.2   46.2 ± 11.0   41.2 ± 13.8  
 TKA 85 (64.4) 35.2 ± 9.4   49.1 ± 11.1   48.2 ± 16.7  
  1. Abbreviation: SD standard deviation, SF-12 Short-Form General Health Survey, PCS physical component scores, MCS mental component scores, WOMAC Western Ontario and McMaster Universities Arthritis Index, BMI Body Mass Index, GDS Geriatric Depression Scale, MMSE Mini-Mental State Examination, UKA unicompartmental knee arthroplasty, TKA total knee arthroplasty
  2. SF-12 (PCS, MCS) ranges from 0 [worst] to 100 [best]
  3. WOMAC-Index is normalised to 100, ranges from 0 [best] to 100 [worst]