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Table 1 Features of the two study samples

From: Development and validation of a Spanish translation of the Yale activity questionnaire

Feature Preoperative sample (N = 44) Follow-up sample (N = 64)
Mean age (SD) 58 (14) 63 (14)
Sex   
  Female (%) 36 (82%) 51 (80%)
  Male (%) 8 (18%) 13 (20%)
Joint operated upon*   
  Knee (%) 29 (67%) 52 (81%)
  Hip (%) 14 (33%) 14 (22%)
Educational attainment   
  Less than high school graduate (%) 34 (77%) 50 (81%)
  High school graduate (%) 10 (23%) 12 (19%)
Number of painful joints   
  0-1 15 (34%) 47 (81%)
  2 21 (48%) 7 (12%)
  3 or more 8 (18%) 4 (7%)
Health status measures (mean (SD))   
  WOMAC** pain 55 (27) 20 (24)
  WOMAC** function 60 (27) 17 (16)
  SF-36 physical activity*** 26 (23) 68 (25)
  EQ-5D 0.56 (0.24) 0.85 (0.15)
  1. *Percentages do not add up to 100% because one patient had both TKR and THR.
  2. **WOMAC = Western Ontario Osteoarthritis Index; range 0–100 with 0 = best.
  3. ***Short-Form 36 Physical Activity Scale; range 0–100 with 100 = best.