90-day all-cause readmission and complications following hospitalisation with pneumonia in patients with and without ankylosing spondylitis (AS)
| 1997–2017* | 1997–2006 | 2007–2017* | ||||
| AS | Non-AS | AS | Non-AS | AS | Non-AS | |
| 90-day readmission, n (%) | 230 (27.3) | 98.445 (25.4) | 78 (28.5) | 39.106 (24.2) | 152 (26.8) | 59.238 (26.4) |
| Crude 90-day HR | 1.08 (0.95 to 1.22) | 1.00 (ref) | 1.14 (0.91 to 1.43) | 1.00 (ref) | 0.96 (0.82 to 1.12) | 1.00 (ref) |
| Adjusted 90-day HR† | 1.12 (0.98 to 1.27) | 1.00 (ref) | 1.15 (0.92 to 1.44) | 1.00 (ref) | 1.05 (0.89 to 1.23) | 1.00 (ref) |
| Pulmonary complication, n (%) | 16 (1.9) | 7.610 (2.0) | 8 (2.9) | 2.650 (1.6) | 8 (1.4) | 4.941 (2.2) |
| Crude HR complication | 0.99 (0.61 to 1.62) | 1.00 (ref) | 1.74 (0.87 to 3.48) | 1.00 (ref) | 0.60 (0.30 to 1.21) | 1.00 (ref) |
| Adjusted HR complication | 0.97 (0.59 to 1.58) | 1.00 (ref) | 1.63 (0.82 to 3.27) | 1.00 (ref) | 0.62 (0.31 to 1.23) | 1.00 (ref) |
HRs with 95% CIs were calculated using a Cox proportional-hazards model.
*Until 31 July 2017.
†Adjusted for sex, age and level of comorbidity (Charlson Index).