S Age at diagnosis is inversely related to
gestational age and degree of prematurity
Gestational age*
Age at onset
Age at onset < 30 weeks 20.2 days
20.2 days 31-33 weeks 13.8 days
13.8 days > 34 weeks 5.4 days
5.4 days Full term 1-3 days
1-3 days*Stoll et al J Ped. 96: 447, 1980