Baseline presence of inflammation and syndesmophytes and mean bone density (Hounsfield Units) for each vertebra
| Vertebra | Presence of inflammation* n/N (%) | Presence of syndesmophytes† n/N (%) | Hounsfield units‡ mean (SD) |
| C3 | 0/44 (0) | 17/40 (43) | 355 (106) |
| C4 | 2/42 (5) | 17/38 (45) | 353 (111) |
| C5 | 3/43 (7) | 21/34 (62) | 330 (108) |
| C6 | 3/41 (7) | 13/30 (43) | 286 (85) |
| C7 | 4/38 (11) | 8/22 (36) | 261 (77) |
| T1 | 5/33 (15) | 7/20 (35) | 243 (81) |
| T2 | 5/48 (10) | 16/39 (41) | 242 (59) |
| T3 | 10/47 (22) | 24/45 (53) | 220 (65) |
| T4 | 14/46 (30) | 30/46 (65) | 212 (68) |
| T5 | 22/48 (46) | 30/48 (63) | 203 (61) |
| T6 | 22/48 (46) | 31/48 (65) | 194 (63) |
| T7 | 19/47 (40) | 33/47 (70) | 183 (71) |
| T8 | 24/48 (50) | 39/48 (81) | 175 (64) |
| T9 | 19/46 (41) | 39/46 (85) | 175 (62) |
| T10 | 20/45 (44) | 37/43 (86) | 171 (62) |
| T11 | 25/48 (52) | 39/46 (85) | 168 (61) |
| T12 | 20/44 (45) | 38/42 (90) | 163 (49) |
| L1 | 21/46 (46) | 37/46 (80) | 163 (56) |
| L2 | 18/46 (39) | 31/44 (70) | 154 (52) |
| L3 | 18/47 (38) | 31/47 (66) | 147 (60) |
| L4 | 12/45 (27) | 27/45 (60) | 149 (63) |
| L5 | 14/46 (30) | 23/46 (50) | 154 (61) |
| Total | 300 (31) 985 obs | 588 (65) 910 obs | 211 (95) 985 obs |
*According to the agreement of 2 out of 3 readers.
†Absolute agreement of both readers.
‡Average of both readers’ continuous score.
BMD, bone mineral density; n, number of vertebrae in which the outcome was reported as present; N, number of vertebrae in which the outcome was assessed; obs, observations.;