Table 2.

Pediatric rare diseases on Orphanet and diseases with at least one group that follow the different inheritance modes (more than one may apply).

Typea	Pediatric rare diseases on Orphanet that follow this inheritance mode, n (%)	Pediatric rare diseases with ≤1 group that follow this inheritance mode, n (%)
Autosomal recessive	1765 (55.6)	314 (38.0)
Autosomal dominant	971 (30.6)	279 (33.8)
X-linked recessive	306 (9.6)	75 (9.1)
X-linked dominant	70 (2.2)	25 (3.0)
Multigenic or multifactorial	74 (2.3)	31 (3.8)
Mitochondrial	15 (0.5)	1 (0.1)
Y-linked	1 (<0.01)	0 (0.0)
Inheritance not applicable	513 (16.2)	197 (23.8)

^aMore than one may apply.