Table 1.
Summary of joint surgery admissions among patients with and without rheumatoid arthritis (RA)
| RA | Non-RA | p value | |
|---|---|---|---|
| Joint surgery admissions, n (%) | 3654 (1.2) | 304,935 (98.8) | |
| Female, n (%) | 2727 (74.6) | 139,184 (45.6) | <0.0001 |
| Age, median years (interquartile range) | 64 (54–72) | 54 (39–67) | <0.0001 |
| Comorbidities during joint surgery admission, n (%) | |||
| Smoker | 386 (10.6) | 40,958 (13.4) | <0.0001 |
| Hypertension | 308 (8.4) | 16,269 (5.3) | <0.0001 |
| dyslipidaemia | 39 (1.1) | 2612 (0.86) | 0.170 |
| Diabetes mellitus | 218 (6.0) | 12,682 (4.2) | <0.0001 |
| Peripheral vascular disease | 16 (0.44) | 410 (0.13) | <0.0001 |
| Pulmonary disease | 74 (2.0) | 1892 (0.62) | <0.0001 |
| Peptic ulcer disease | 12 (0.33) | 269 (0.09) | <0.0001 |
| Renal disease | 56 (1.5) | 1744 (0.57) | <0.0001 |
| Liver disease | 2 (0.05) | 104 (0.03) | 0.504 |
| Cerebrovascular accident | 21 (0.57) | 787 (0.26) | <0.0001 |
| Congestive heart failure | 56 (1.5) | 1673 (0.55) | <0.0001 |
| Cancer or metastatic cancer | 15 (0.14) | 844 (0.28) | 0.127 |
| Paraplegia | 16 (0.44) | 466 (0.15) | <0.0001 |
| Dementia | 6 (0.16) | 333 (0.11) | 0.318 |
| Human immunodeficiency disease | 0 | 40 (0.01) | 0.489 |
| Lowest quartile of socioeconomic statusa, n (%) | 446 (12.2) | 32,312 (10.6) | 0.002 |
| High accessibility to goods and servicesb, n (%) | 3214 (88.0) | 269,242 (88.3) | 0.301 |
| Public hospital patient, n (%) | 1343 (36.8) | 76,246 (25.0) | <0.0001 |
| Elective admission, n (%) | 3428 (93.8) | 294,892 (96.7) | <0.0001 |
| English-speaking country of birth, n (%) | 3119 (85.4) | 259,100 (85.0) | 0.512 |
| Hip and knee total, partial or revision arthroplasty, n (%) | 2028 (55.5) | 81,094 (26.6) | <0.0001 |
aIndex of Relative Socioeconomic Disadvantage from the Australian Bureau of Statistics 2006 Census data; bAccessibility Remoteness Index of Australia