Table 1. Patient characteristics.
| Variables | Complete cohort (N=38) | Toronto (N=21) | Zurich (N=17) | P value* | Initial cohort by Ladner et al. (11) (N=25) |
|---|---|---|---|---|---|
| Available hemispheres | 72 | 41 | 31 | – | 46 |
| Age (years), mean [range] | 54 [20–82] | 57 [29–82] | 49 [20–72] | 0.01 | 42 |
| Female | 27 (71%) | 17 | 10 | 0.01 | 20 |
| Prior stroke | 33 (46%) | 20 | 13 | 0.56 | 30 |
| CVR impairment | 46 (64%) | 28 | 18 | 0.26 | 35 |
| Modified Suzuki Score | 0.01 | ||||
| 0 | 13 (18%) | 5 | 8 | 3 | |
| 1 | 5 (7%) | 2 | 3 | 5 | |
| 2 | 20 (28%) | 8 | 12 | 20 | |
| 3 | 19 (26%) | 14 | 5 | 14 | |
| 4 | 15 (21%) | 12 | 3 | 4 | |
| Affected collaterals | 0.03 | ||||
| 0 | 24 (33%) | 14 | 10 | 10 | |
| 1 | 5 (7%) | 2 | 3 | 1 | |
| 2 | 7 (10%) | 1 | 6 | 6 | |
| 3 | 9 (13%) | 3 | 6 | 10 | |
| 4 | 13 (18%) | 10 | 3 | 10 | |
| 5 | 10 (14%) | 7 | 3 | 3 | |
| 6 | 4 (5%) | 4 | 0 | 3 | |
| PIRAMD score | 0.01 | ||||
| 0 | 12 (17%) | 5 | 7 | 2 | |
| 1 | 1 (1%) | 0 | 1 | 2 | |
| 3 | 8 (11%) | 5 | 3 | 3 | |
| 4 | 1 (1%) | 0 | 1 | 1 | |
| 6 | 6 (8%) | 4 | 2 | 3 | |
| 7 | 7 (10%) | 6 | 1 | 7 | |
| 9 | 13 (18%) | 7 | 6 | 8 | |
| 10 | 22 (31%) | 14 | 8 | 20 | |
| PIRAMD grade | 0.23 | ||||
| 1 | 22 (31%) | 10 | 12 | 8 | |
| 2 | 28 (38%) | 17 | 11 | 18 | |
| 3 | 22 (31%) | 14 | 8 | 20 | |
| Symptomatic hemispheres | 39 (54%) | 24 | 15 | 0.40 | 28 |
*, P<0.05 was considered statistically significant. CVR, cerebrovascular reactivity; PIRAMD, Prior Infarcts, Reactivity, and Angiography in Moyamoya Disease.