Table 2 Descriptive analysis of all vertebral edges evaluated in this study at both assessment time points.

	Vertebral edges, n (%)
Baseline damage
No damage (mSASSS‚ 0)	2181 (79.4)
Sclerosis, erosion or squaring (mSASSS‚ 1)	253 (9.2)
Syndesmophyte (mSASSS‚ 2)	150 (5.5)
Ankylosis (mSASSS‚ 3)	164 (6.0)
Missing sites	36 (1.3)
Change in scorings
No change	2520 (91.7)
Deterioration of ⩾1 mSASSS unit	177 (6.5)
Deterioration from no damage to suspicious damage	59 (2.2)
Deterioration from no damage to definite damage	53 (2.4)
Deterioration from suspicious damage to definite damage	37 (14.6)
Deterioration from syndesmophyte to ankylosis	28 (18.7)