ÄTable 2. The likelihood of retinopathy of prematurity (ROP) needing treatmentas a function of gestational age.

Gestational age at birth	Likelihood of ROP needing treatment (Sweden)	Likelihood ofROP needing treatment (Germany)
22 weeks	72%	33%
23 weeks	51%	23%
24 weeks	15%	17%
25 weeks	17%	7%
26 weeks	6%	4%

Epidemiologic data reveal that extremely premature neonates have a high rate of retinopathy requiring treatment. Swedish data from (22); German data from the German Neonatal Network, 2009–2014