Summary and comparison of driving disability severity groups over time.
| Timepoint | Severity Group | Cervical Disc Arthroplasty (N = 209) | Anterior Cervical Discectomy and Fusion (N = 188) | P a |
| Preoperative | None | 2/209 (1.0%) | 1/188 (0.5%) | 0.968 |
| Mild | 88/209 (42.1%) | 78/188 (41.5%) | ||
| Severe | 119/209 (56.9%) | 109/188 (58.0%) | ||
| 6 wk | None | 67/204 (32.8%) | 42/179 (23.5%) | 0.001 |
| Mild | 106/204 (52.0%) | 83/179 (46.4%) | ||
| Severe | 31/204 (15.2%) | 54/179 (30.2%) | ||
| 3 mo | None | 94/202 (46.5%) | 67/177 (37.9%) | 0.217 |
| Mild | 87/202 (43.1%) | 91/177 (51.4%) | ||
| Severe | 21/202 (10.4%) | 19/177 (10.7%) | ||
| 6 mo | None | 113/203 (55.7%) | 79/171 (46.2%) | 0.014 |
| Mild | 77/203 (37.9%) | 66/171 (38.6%) | ||
| Severe | 13/203 (6.4%) | 26/171(15.2%) | ||
| 1 y | None | 119/202 (58.9%) | 78/164 (47.6%) | 0.068 |
| Mild | 66/202 (32.7%) | 64/164 (39.0%) | ||
| Severe | 17/202 (8.4%) | 22/164 (13.4%) | ||
| 2 y | None | 113/197 (57.4%) | 78/157 (49.7%) | 0.180 |
| Mild | 69/197 (35.0%) | 59/157 (37.6%) | ||
| Severe | 15/197 (7.6%) | 20/157 (12.7%) | ||
| 3 y | None | 110/183 (60.1%) | 68/146 (46.6%) | 0.044 |
| Mild | 59/183 (32.2%) | 60/146 (41.1%) | ||
| Severe | 14/183 (7.7%) | 18/146 (12.3%) | ||
| 5 y | None | 105/166 (63.3%) | 56/134 (41.8%) | <0.001 |
| Mild | 50/166 (30.1%) | 59/134 (44.0%) | ||
| Severe | 11/166 (6.6%) | 19/134 (14.2%) | ||
| 7 y | None | 94/153 (61.4%) | 53/120 (44.2%) | 0.014 |
| Mild | 46/153 (30.1%) | 49/120 (40.8%) | ||
| Severe | 13/153 (8.5%) | 18/120 (15.0%) | ||
| 10 y | None | 89/144 (61.8%) | 47/114 (41.2%) | 0.003 |
| Mild | 46/144 (31.9%) | 51/114 (44.7%) | ||
| Severe | 9/144 (6.3%) | 16/114 (14.0%) |
aP values were from Fisher exact test.