Characteristic | Rheumatoid Arthritis (%) | Psoriatic Arthritis (%) | Ankylosing Spondylitis (%) | Primary Osteoarthritis (%) | P-value |
---|---|---|---|---|---|
Incidence rate | 2.90 | 0.16 | 0.16 | 85.94 | – |
Female | 12,868(74.87) | 490(50.94) | 248(26.38) | 282,952(55.68) | < 0.0001 |
Age group | < 0.0001 | ||||
  ≤ 65 | 8670(50.43) | 657(68.3) | 661(70.24) | 248,426(48.81) | |
 65–80 | 6667(38.78) | 265(27.55) | 232(24.65) | 198,216(38.94) | |
  ≥ 80 | 1856(10.8) | 40(4.16) | 48(5.1) | 62,344(12.25) |  |
 obesity | 2263(13.16) | 174(18.09) | 99(10.52) | 75,261(14.77) | < 0.0001 |
Elective admission | 15,299(89.11) | 899(93.45) | 879(93.61) | 479,874(94.39) | < 0.0001 |
Comorbidity | 4.0734 | 2.986 | 3.606 | 3.174 | < 0.0001 |