Table 1 Sample differences on demographic measures (N = 120)
| Â | Group | Â | Â | ||
|---|---|---|---|---|---|
Osteoarthritis (N = 40) | Rheumatoid Arthritis (N = 40) | Control (N = 40) |  |  | |
Measure | Mean (SD) or N (%) | Mean (SD) or N (%) | Mean (SD) or N (%) | F / χ2 | p |
Age | 57.90 (17.51) | 59.35 (16.52) | 54.40 (15.87) | 0.94 | .396 |
Body mass index | 23.73 (3.90) | 24.03 (2.59) | 22.54 (2.58) | 2.62 | .077 |
Current Relationship (Yes) | 33 (83%) | 27 (68%) | 34 (85%) | 4.22 | .121 |
Education status | Â | Â | Â | 4.03 | .855 |
 Primary school | 13 (32%) | 13 (33%) | 14 (35%) |  |  |
 Middle school | 15 (38%) | 15 (37%) | 18 (45%) |  |  |
 High school | 4 (10%) | 4 (10%) | 2 (5%) |  |  |
 Post-Secondary | 8 (20%) | 4 (20%) | 4 (15%) |  |  |
Cigarette Smoking status | |||||
 Non-smoker | 33 (83%) | 35 (88%) | 31 (78%) | 1.39 | .500 |
 Smoker | 7 (17%) | 5 (12%) | 9 (22%) |  |  |
Current Alcohol Use | |||||
 Non-drinker | 33 (83%) | 32 (80%) | 35 (88%) | 0.84 | .657 |
 Drinker | 7 (17%) | 8 (20%) | 5 (12%) |  |  |
Pain Duration (in months) | 127.4 (128.26) | 139.1 (117.37) | – | 0.18 | .672 |
Pain-Related Interference with Daily Activities | 3.45 (1.01) | 3.50 (1.06) | – | 0.05 | .830 |