The prevalence of IAAs greater than or equal to the 97.5th percentile of schoolchildren control subjects in unaffected siblings and parents
| Antibody markers | Age at diagnosis of the proband | ||
|---|---|---|---|
| <5 years | 5–9 years | 10–14 years | |
| Siblings | |||
| n | 178 | 368 | 623 |
| None | 141 (79) | 332 (90) | 537 (86) |
| 1 | 24 (13) | 28 (8) | 71 (11) |
| 2 | 4 (2.2) | 5 (1.4) | 6 (1.0) |
| 3 | 7 (3.9) | 1 (0.3) | 6 (1.0) |
| 4 | 2 (1.1) | 2 (0.5) | 3 (0.5) |
| Parents | |||
| n | 515 | 702 | 913 |
| None | 456 (89) | 631 (89) | 815 (89) |
| 1 | 48 (9) | 60 (9) | 81 (9) |
| 2 | 4 (0.8) | 6 (0.9) | 13 (1.4) |
| 3 | 7 (1.4) | 4 (0.6) | 3 (0.3) |
| 4 | 1 (0.1) | 1 (0.1) | |
Data are n (%).