| Stratified variable | Total number | Prescribers | Percentage |
| (n = 91) | (n = 23) | (%) | |
| Country | |||
| Australia | 80 | 23 | 28.8 |
| New Zealand | 11 | 0 | 0.0 |
| State | |||
| NSW | 26 | 5 | 19.2 |
| VIC | 23 | 6 | 26.1 |
| QLD | 18 | 8 | 44.4 |
| SA | 7 | 1 | 14.3 |
| WA | 4 | 3 | 75.0 |
| ACT | 2 | 0 | 0.0 |
| TAS | 0 | 0 | 0.0 |
| Experience of neurosurgeon* | |||
| 1971-1980 | 12 | 3 | 25.0 |
| 1981-1990 | 6 | 3 | 50.0 |
| 1991-2000 | 30 | 7 | 23.3 |
| 2001-2010 | 30 | 7 | 23.3 |
| 2011-present | 13 | 3 | 23.1 |