Demographic features of study cohorts at baseline*
| Variable (% missing data) | Australia cohort (n=144) | Canadian replication cohort (n=571) | UK cohort (n=428) | US cohort (n=1001) | Combined cohort (n=2144) |
|---|---|---|---|---|---|
| Age | NA (100) | NA (100) | NA (100) | 45.7±14.5 (10.6) | 45.7±14.5 (58.3) |
| % female | 17.4 (0) | 24.9 (0) | 23.8 (0.7) | 29.1 (10.1) | 26 (4.9) |
| Cervical mSASSS | 9.3±12.8 (23.6) | 9.8±12 (0) | 9.1±12.1 (22.4) | 10±13.3 (13.6) | 9.8±12.7 (12.4) |
| Lumbar mSASSS | 6.3±11.4 (16) | 7.8±11.1 (0) | 8.7±11.6 (6.5) | 8.2±11.9 (5.1) | 8±11.6 (4.8) |
| Total mSASSS | 13.6±20.3 (31.2) | 17.5±21 (0) | 17.7±21.1 (27.3) | 17.3±22.7 (16.8) | 17.2±21.8 (15.4) |
| Disease duration, years | 17.9±12.8 (1.4) | 16.3±11.1 (0) | 24.1±13.4 (5.1) | 21.3±14.2 (8.4) | 20.2±13.4 (5) |
*Except where indicated otherwise, values are the mean±SD.
mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score.