Table 1 Genetic mutations of early treated (before 1st birthday; group A) and later treated (after 1st birthday; group B) patients
|  | Group A (n = 21) | Group B (n = 41) |
|---|---|---|
Paternal deletion | n = 10 (47.6%) | n = 9 (21.95%) |
Maternal uniparental disomy | n = 1 (4.8%) | n = 18 (43.9%) |
Imprinting defect | n = 1 (4.8%) | n = 0 (0%) |
Genetically confirmed PWS, no subtype | n = 9 (42.8%) | n = 14 (34.15%) |