Frequency of antibodies against nodal proteins
| Country | Patients (n) | CNTN1-positive (n) | NF155-positive (n) | NF186-positive (n) | References |
| Spain | 46 | 2 | – | – | 23 |
| Germany | 53 | 4 | – | – | 24 |
| Japan | 533 | 13 | 25 | ||
| Spain | 53 | – | 2 | – | 27 |
| Australia | 44 | 3 | 3 | 0 | 26 |
| Japan Germany Sweden | 117 | – | 5 | 1 (cobinding) | 69 |
| Japan | 50 | – | 9 | 0 | 30 |
| Japan | 533 | – | 38 | – | 28 |
| USA | 40 | – | 4 | 0 | 29 |
| Australia | 144 | – | 32 | – | 70 |
| Japan | 191 | – | 15 | – | 31 |
| France Spain Italy | 246 | 2 | 9 | 1/5 (NF140/NF186) | 33 |
CNTN1, contactin-1; NF, neurofascin.