Number patients, HIF/pt., AMF/pt., HIF to AMF ratio, and AMF>HIF/pt. in HIF or AMF-only, HIF+AMF, and AMF>HIF subgroups for all Chiari I and control groups, with and without SL
| No. | HIF/Pt. | AMF/Pt. | Ratio | AMF>HIF | |
|---|---|---|---|---|---|
| All Chiari I | 25 | 8.6 | 4.1 | 2.1 | 2.2 |
| All control | 25 | 3.9 | 2.7 | 1.4 | 1 |
| All Chiari I and controls | |||||
| HIF only | |||||
| Chiari I | 1 | 7 | NA | NA | 2.3 |
| Control | 1 | 12 | NA | NA | 1.0 |
| AMF only | 0 | NA | NA | NA | NA |
| HIF+AMF | |||||
| Chiari I | 24 | 8.6 | 4.3 | 2.0 | 2.1 |
| Control | 23 | 3.9 | 3 | 1.3 | 1.1 |
| AMF-HIF | |||||
| Chiari I | 22 | 7.9 | 4.7 | 1.7 | 2.5 |
| Control | 16 | 4.4 | 3.3 | 1.3 | 1.5 |
| No AMF→HIF | |||||
| Chiari I | 3 | 13.7 | 1.7 | 8.2 | 0 |
| Control | 9 | 3 | 1.7 | 1.8 | 0 |
| SL | |||||
| Chiari I | 14 | 10.1 | 4.6 | 2.2 | 2.9 |
| Control | 7 | 7 | 3.4 | 2.1 | 1.3 |
| HIF+AMF | |||||
| Chiari I | 14 | 10.1 | 4.6 | 2.2 | 2.2 |
| Control | 6 | 6.2 | 4 | 1.6 | 1.5 |
| AMF-HIF | |||||
| Chiari I | 12 | 8.6 | 5 | 1.7 | 2.9 |
| Control | 5 | 7.2 | 4 | 1.8 | 1.8 |
| No SL | |||||
| Chiari I | 11 | 6.6 | 3.5 | 1.9 | 1.9 |
| Control | 18 | 2.7 | 2.4 | 1.1 | 0.8 |
| HIF+AMF | |||||
| Chiari I | 11 | 6.8 | 3.9 | 1.7 | 2.1 |
| Control | 17 | 2.9 | 3 | 0.9 | 0.9 |
| AMF-HIF | |||||
| Chiari I | 9 | 7 | 4.2 | 1.7 | 2.2 |
| Control | 11 | 3.1 | 3 | 1.1 | 1.2 |
Note:—NA indicates not applicable.