Age and duration of follow up
| Age group (at trab) | Number of patients | Mean age (years) | Median follow up (months) | Follow up 25th to 75th percentile | Proportion of operations by training grade |
|---|---|---|---|---|---|
| 45–50 | 16 | 48.4 | 49.5 | 30.8–78.5 | 50% |
| 51–55 | 21 | 52.7 | 54 | 25–68 | 42.9% |
| 56–60 | 25 | 58.2 | 40 | 35–82 | 72% |
| 61–65 | 36 | 63.0 | 53 | 29.8–90 | 58.3% |
| 66–70 | 28 | 68.1 | 49 | 34.8–75.2 | 50% |
| 71–75 | 28 | 72.9 | 68 | 44.8–87.8 | 60.7% |
| 76–80 | 30 | 78.2 | 53 | 30–79 | 60% |
| 81–85 | 24 | 82.5 | 36 | 27–63 | 83.3% |
| All ages | 208 | 66.7 | 53.5 | 31–80 | 60.1% |