Demographics for patients undergoing primary spinal surgery between 1 January 2015 and 20 May 2018, grouped by the type of surgery.
| Characteristic | All Operations (n = 2110) | All Operations With Implants (n = 973) | Decompression/Laminectomy (n = 620) | Open Discectomy (n = 380) | Posterior Spinal Fusion and Fixation (n = 374) | Deformity Surgery (n = 147) | Anterior Spinal Fusion (n = 129) |
| Women | 1035 (49.1) | 487 (50.1) | 304 (49.0) | 181 (47.6) | 189 (50.5) | 114 (77.6) | 55 (42.6) |
| Age (at primary operation) | 55.3 (19.9), 58 (6; 93) | 54.2 (21.2), 58 (6; 92) | 67.2 (13.5), 70.0 (22; 93) | 43.8 (13.7), 41 (16; 89) | 62.1 (14.5), 64 (14; 92) | 23.7 (17.3), 16 (6; 75) | 55,4 (14.8), 54(15; 86) |
| ASA classification score (at primary operation) | |||||||
| I | 715 (33.9) | 287 (29.5) | 107 (17.3) | 235 (61.8) | 65 (17.4) | 82 (55.8) | 48 (37.2) |
| II | 861 (40.8) | 395 (40.6) | 302 (48.7) | 128 (33.7) | 175 (46.8) | 47 (32.0) | 57 (44.2) |
| III | 510 (24.2) | 274 (28.2) | 205 (33.1) | 17 (4.5) | 129 (34.5) | 18 (12.2) | 23 (17.8) |
| IV | 23 (1.1) | 16 (1.6) | 6 (1.0) | - | 5 (1.3) | - | 1 (0.8) |
| V | 1 (0.05) | 1 (0.1) | - | - | - | - | - |
| Operating time (min) | 119.0 (77.1), 100 (6; 779) | 167.0 (78.1), 153 (6; 779) | 81.5 (36.0), 75 (19; 312) | 62.4 (29.4), 55 (15; 212) | 180.0 (73.9), 166(51; 521) | 216.9 (94.6), 195 (26; 531) | 145.3 (46.1), 137 (65; 331) |
| Patients requiring reoperation | 232 (11.0) | 132 (13.6) | 60 (9.7) | 25 (6.6) | 54 (14.4) | 28 (19.0) | 10 (7.8) |
| Total number of reoperations | 389 | 263 | 66 | 34 | 118 | 44 | 13 |
| Patients requiring >1 reoperation | 55 (2.6) | 45 (4.6) | 4 (0.6) | 4 (1.1) | 18 (4.8) | 11 (7.5) | 3 (2.3) |
Abbreviations: ASA, American Society of Anesthesiologists.
Note: For categorical variables, n (%) is presented. For continuous variables, the mean (SD), median (min; max) is presented.