Table 1.
Relationship between annual surgical volume and IOM variables: cases/year, personnel, experience, provider.
| Low < 300 n = 4 |
Medium 300–600 n = 17 |
High 600–1200 n = 24 |
Very high 1200–2000 n = 9 |
Total n = 54 | |
|---|---|---|---|---|---|
| IOM case/year | |||||
| <10 | 1 (25%) | ||||
| 10–50 | 3 (75%) | 9 (53%) | 6 (25%) | ||
| 50–100 | 8 (47%) | 12 (50%) | 3 (33%) | 23 (43%) | |
| >200 | 6 (25%) | 6 (64%) | 12 (22%) | ||
| IOM provider | |||||
| Neurosurgeon | 1 (25%) | 4 (23%) | 4 (17%) | 1 (11%) | 10 (19%) |
| Neurologist/clinical neurophysiologist | 2 (50%) | 5 (29%) | 13 (54%) | 5 (55%) | 25 (46%) |
| External consultant | 1 (25% | 7 (41%) | 5 (21%) | 13 (24%) | |
| Technician | 1 (6%) | 2 (8%) | 3 (33%) | 6 (11%) | |
| IOM experience (in year) | |||||
| <2 | 1 (25%) | 2 (12%) | 3 (5%) | ||
| 2–5 | 7 (41%) | 10 (42%) | 2 (22%) | 19 (35%) | |
| 5–10 | 3 (75%) | 5 (29%) | 6 (25%) | 1 (11%) | 15 (28%) |
| >10 | 3 (18%) | 8 (33%) | 6 (67%) | 17 (31%) | |
| IOM experience (in number of procedure) | |||||
| <50 | 2 (50%) | 2 (12%) | |||
| 50–100 | 4 (24%) | 8 (33%) | |||
| 100–300 | 1 (25%) | 5 (29%) | 5 (21%) | 1 (11%) | |
| 300–500 | 2 (12%) | 2 (8%) | 1 (11%) | ||
| >500 | 1 (25%) | 4 (24%) | 9 (37%) | 7 (78%) | |
| IOM availability | |||||
| always on request | 3 (75%) | 10 (59%) | 21 (87%) | 8 (89%) | |
| limited | 1 (25%) | 7 (41%) | 3 (13%) | 1 (11%) | |