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Comparison of Sex Ratios in Familial Cases Versus Unrelated Cases Who Report No Family History
| Group | No Family History | Males | Females | Male-to-Female Ratio |
| Familial, NIH | 0 | 137 | 87 | 1.57 |
| Unrelated, HCRI | 468 | 410 | 58 | 7.07 |
| Unrelated, AIS | 435 | 360 | 75 | 4.8 |
