Characteristics of patients with ankylosing spondylitis who were hospitalised for pneumonia from 1997 to 2016 in Denmark and registered in DANBIO
| Registration in DANBIO at any time prior to the hospitalisation for pneumonia | Registration in DANBIO 0–12 months prior to the hospitalisation for pneumonia | |
| N | 185 | 133 |
| Age, median (IQR) | 53.8 (43–65) | 52.2 (42–62) |
| 16–29 years (%) | 10 (5.4) | 6 (4.5) |
| 30–44 years (%) | 44 (23.8) | 34 (25.6) |
| 45–59 years (%) | 60 (32.4) | 52 (39.1) |
| 60–74 years (%) | 56 (30.3) | 33 (24.8) |
| 75 years and above | 15 (8.1) | 8 (6.0) |
| Sex | ||
| Female (%) | 54 (29.2) | 38 (28.6) |
| Male (%) | 131 (70.8) | 95 (71.4) |
| Year of pneumonia hospitalisation | ||
| 1997–2006 | 8 | 8 |
| 2006–2017 | 177 | 125 |
| Comorbidity index (Charlson Index Score) | ||
| Low (0) | 103 (55.7) | 80 (60.2) |
| Medium (1–2) | 54 (29.2) | 35 (26.3) |
| High (≥3) | 28 (15.1) | 18 (13.5) |
| Patients with BASDAI available (%) | 148 (80.0) | 110 (82.7) |
| BASDAI <4 (% of available) | 66 (44.5) | 51 (46.4) |
| Patients with BASFI available (%) | 146 (78.9) | 109 (82.0) |
| BASFI <4 (% of available) | 62 (42.5) | 52 (47.7) |
| Patients with BASMI available (%) | 95 (51.4) | 70 (52.6) |
| BASMI <4 (% of available) | 49 (51.7) | 39 (55.7) |
BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath AS Functional Index; BASMI, Bath AS Metrology Index.