Univariable and multivariable analysis on factors associated with axial psoriatic arthritis.
| Variables | Axial Disease, Present vs Absent | |||
|---|---|---|---|---|
| Univariable Analysis | Multivariate Analysis, n = 1528 | |||
| OR | 95% CI | OR | 95% CI | |
| Age | 0.98 | 0.97–0.99 | 0.98 | 0.97–0.99 |
| Sex (male vs female) | 1.58 | 1.26–1.98 | 1.49 | 1.17–1.89 |
| Smoking | ||||
| Current vs never | 1.7 | 1.33–2.27 | 1.42 | 1.07–1.88 |
| Ex-smoker vs never | 1.03 | 0.77–1.37 | 0.97 | 0.71–1.31 |
| Nail involvement, ever (presence vs absence) | 1.41 | 1.13–1.76 | 1.43 | 1.14–1.80 |
| Polyarthritis, ever (presence vs absence) | 0.73 | 0.58–0.91 | 0.71 | 0.56–0.89 |
| DIP involvement, ever (presence vs absence) | 0.60 | 0.43–0.84 | 0.56 | 0.40–0.80 |
Values in bold face are statistically significant. DIP: distal interphalangeal joint.