Comparison between IFA and AFA
| Parameters | AFA | IFA | 
|---|---|---|
| Etiology | Mutations AAAS 12q13 | Multifactorial Genetic? Environment?  | 
| Disease | Multisystemic | Esophagus | 
| Frequency | 5 times | 1 time | 
| Consanguinity | 73.2% | 15.2% | 
| Disease transmission | Horizontal only siblings | Horizontal/vertical siblings | 
| Prognosis | Autonomic abnormalities Adrenal insufficiency  | Good | 
| PD | Low long-term remission | |
?: not proven as an etiological factor (remains hypothetical)