| AA (n = 179) | ΔT < 7 hours | ΔT > 7 hours | Total |
| Stage I | 0 | 0 | 0 |
| Stage II | 12 (6.2%) | 14 (7.2%) | 26 (13.3%) |
| Stage III | 37 (19%) | 41 (21%) | 78 (40%) |
| Stage IV | 48 (25%) | 43 (22%) | 91 (47%) |
| Total | 97 (49.7%) | 98 (50.3%) | 195 |