| Variable |
| Number | % | ||
| Gender | Male | 8 | 22.2 | ||
| Female | 28 | 77.8 | |||
| Background | Junior trainee | 21 | 58.3 | ||
| Senior trainee | 3 | 8.3 | |||
| GP obstetrician | 12 | 33.3 | |||
| Estimated number of previous vacuum deliveries | 0 | 4 | 11.1 | ||
| 1 - 10 | 15 | 41.7 | |||
| 10 - 30 | 7 | 19.4 | |||
| >30 | 10 | 27.8 | |||