Clinical characteristics and DSA parameters versus IRS
| Characteristic | Total (n=20) | IRS | P value | OR (95% CI) | Adjusted p value | |
| Present (n=12) | Absent (n=8) | |||||
| Mean age, years | 38.1±11.6 | 38.0±11.0 | 38.1±13.1 | 0.982 | — | — |
| Sex | 0.848 | 1.08 (0.50 to 2.33) | — | |||
| Male | 7 (35.0) | 4 (33.3) | 3 (37.5) | |||
| Female | 13 (65.0) | 8 (66.7) | 5 (62.5) | |||
| Medical history | ||||||
| Smoking | 4 (20.0) | 2 (16.7.0) | 2 (25.0) | 0.648 | 1.25 (0.44 to 3.58) | — |
| Drinking | 2 (10.0) | 1 (8.3) | 1 (12.5) | 0.761 | 1.22 (0.29 to 5.13) | — |
| Diabetes | 1 (5.0) | 0 (0) | 1 (12.5) | 0.209 | — | — |
| Hypertension | 3 (15.0) | 2 (16.7) | 1 (12.5) | 0.798 | 0.88 (0.36 to 2.16) | — |
| Size, mm | 35.8±13.3 | 37.7±14.9 | 33.8±12.1 | 0.528 | — | — |
| Location | 0.444 | 1.32 (0.67 to 2.64) | — | |||
| ICA | 7 (35.0) | 5 (41.7) | 2 (25.0) | |||
| MCA | 13 (65.0) | 7 (58.3) | 6 (75.0) | |||
| Shape | 0.550 | 1.29 (0.53 to 3.13) | — | |||
| Saccular | 14 (70.0) | 9 (75.0) | 5 (62.5) | |||
| Serpentine | 6 (30.0) | 3 (25.0) | 3 (37.5) | |||
| RDFI | 2.6±1.2 | 3.3±1.0 | 1.5±0.4 | <0.001 | 132.17 (1.28 to 13 606.13)* | 0.039 |
| RDDI | 1.3±0.3 | 1.3±0.3 | 1.3±0.2 | 0.905 | 0.615 (0.12 to 30.787)* | 0.808 |
Data are presented as n (%) or mean±SDs, unless otherwise indicated.
*Adjusted for age, sex, smoking and hypertension.
DSA, digital subtraction angiography; ICA, internal carotid artery; IRS, insufficient flow-related stroke; MCA, middle cerebral artery; RDDI, recipient/donor diameter index; RDFI, recipient/donor flow index.