Liverpool Hospital | p | Rush University Medical Center | p | NYU Hospital for Joint Diseases | p | Ridley Park | p Value | |||||
RA (n=64) | OA (n=55) | RA (n=173) | OA (n=199) | RA (n=145) | OA (n=173) | RA (n=149) | OA (n=202) | |||||
Demographic measures | ||||||||||||
Age, mean (SD) years | 58.6 (14.0) | 66.1 (10.7) | 0.001 | 57.9 (15.9) | 67.2 (12.1) | <0.001 | 49.3 (15.7) | 62.6 (12.4) | <0.001 | 61.3 (15.7) | 70.5 (12.3) | <0.001 |
Education level (years) | 10 (9–12) | 10 (8–12) | 0.11 | 14 (12–16) | 14 (12–16) | 0.85 | 16 (13–18) | 16 (13–18) | 0.99 | 12.5 (12–15.5) | 12 (12–14) | 0.09 |
Female, % | 79.7% | 88.6% | 0.58 | 86.1% | 85.4% | 0.84 | 75% | 76% | 0.85 | 75% | 73% | 0.66 |
Disease duration, years | 6.7 (3.5–14.3) | 4.4 (1.4–7.4) | 0.01 | NA | NA | NA | NA | NA | NA | 6.9 (2.8–14.2) | 3.9 (1.1–9.9) | <0.001 |
Values are median and IQR unless indicated otherwise. Mann-Whitney for non-normally distributed variables, t-test for normally distributed variables and χ2 for qualitative variables.
NA, not available; OA, osteoarthritis; RA, rheumatoid arthritis.