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Spread of potential difficulty score between the high and low volume surgeon groups
| Scores | High volume group | Low volume group | Total |
| 1 | 201 (68%) | 137 (59%) | 338 (64%) |
| 2 | 61 (21%) | 56 (24%) | 117 (22%) |
| 3 | 20 (7%) | 32 (13%) | 52 (10%) |
| 4 | 12 (4%) | 6 (3%) | 18 (3.5%) |
| 5 | 0 (0%) | 2 (0.8%) | 2 (0.4%) |
| 6 | 1 (0.3%) | 0 (0%) | 1 (0.1%) |
