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Table 1 Baseline patients’ characteristics of responders and non-responders to the 12-month follow-up questionnaire

From: A prospective study of the association of patient expectations with changes in health-related quality of life outcomes, following total joint replacement

  Responders (N = 892) Non-responders (N = 789) p value
Age in years: mean (SD) 68.74 (9.92) 69.07 (9.65) 0.505
Joint: hip: n (%) 365 (40.92%) 289 (36.26%) 0.051
Gender: female: n (%) 529 (59.37%) 507 (63.77%) 0.71
BMI: mean (SD) 29.37 (4.61) 29.98 (4.71) 0.012
WOMAC: mean (SD)    
Pain 55.26 (18.17) 58.60 (19.54) <0.001
Stiffness 56.92 (24.24) 60.70 (24.46) 0.002
Function 62.53 (17.28) 66.65 (17.28) <0.001
SF-12: mean (SD)    
PCS 29.80 (7.08) 29.69 (7.46) 0.787
MCS 43.34 (14.23) 41.21 (14.40) 0.006
Higher education: n (%)    
Secondary education/University 176 (20.39%) 121 (15.71%) <0.001
Primary education 511 (59.21%) 419 (54.42%)  
None 176 (20.39%) 230 (29.87%)  
Previous intervention: n (%)    
Yes 311 (36.4%) 287 (37.18%) 0.758
No 543 (63.6%) 485 (62.82%)  
Expectation items    
Pain relief: n (%)    
Low 89 (10.31%) 135 (17.26%) <0.001
High 287 (33.26%) 282 (36.06%)  
Very high 487 (56.43%) 365 (46.68%)  
Daily activities: n (%)    
Low 165 (18.94%) 215 (27.53%) <0.001
High 407 (46.73%) 326 (41.74% )  
Very high 299 (34.33%) 240 (30.73%)  
Ability to walk: n (%)    
Low 82 (9.40%) 130 (16.71%) <0.001
High 352 (40.37%) 329 (42.29%)  
Very high 438 (50.23%) 319 (41.00%)  
To interact with others: n (%)    
Low 221 (26.06%) 257 (33.68%) 0.002
High 330 (38.92%) 330 (38.92%)  
Very high 297 (35.02%) 221 (28.96%)  
Psychological well-being: n (%)    
Low 171 (20.38%) 200 (26.49%) 0.015
High 355 (42.31%) 290 (38.41%)  
Very high 313 (37.31%) 265 (35.10%)  
  1. Score direction: WOMAC, higher scores indicating worse HRQoL; SF-12, higher scores indicating better HRQoL.
  2. SD, Standard deviation; BMI, Body Mass Index; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index; SF-12, Short Form 12; PCS, physical component summary of the SF-12; MCS, mental component summary of the SF-12.