Progression of radiographic damage over time
| Progression§ | Number of intervals out of all 2-year intervals | Number of patients during all 2-year intervals (maximum progression)* | Number of patients from the ‘12-year completers’ during all 2-year intervals (maximum progression)* | Number of patients during the first 2-year interval (Y0–Y2) (n (%)) |
|---|---|---|---|---|
| (n (%)) (N=520) | (n (%)) (N=186) | (n (%)) (N=68) | (N=164) | |
| 0 mSASSS-units | 204 (39) | 45 (24) | 12 (18) | 75 (46) |
| >0 & <1 mSASSS-units** | 0 (0) | 8 (4) | 1 (1) | 11 (7) |
| ≥1 mSASSS-unit | 282 (54) | 133 (72) | 54 (79) | 78 (48) |
| ≥2 mSASSS-units (mean progression)¥ | 152 (29) | 86 (46) | 39 (57) | 41 (25) |
| ≥1 & <3 mSASSS-units | 161 (31) | 60 (32) | 21 (31) | 42 (26) |
| ≥3 mSASSS-units | 121 (23) | 73 (39) | 33 (49) | 36 (22) |
| ≥3 & <5 mSASSS-units | 58 (11) | 32 (17) | 12 (18) | 16 (10) |
| ≥5 mSASSS-units | 63 (12) | 41 (22) | 21 (31) | 20 (12) |
mSASSS – modified Stoke Ankylosing Spondylitis Spine Score.
§Categories of progression are not mutually exclusive.
*Number and proportion of patients, whose maximum 2-year progression score, during follow-up (up to 12 years), met the criterion of each of the rows.
**This category of progression existed because of imputations, which made some status scores and hence progression scores have decimal values.
¥Mean progression taking all 2-year intervals into account.