Table 1.

ART as an independent risk factor for ROP

Author/year	Country	Follow-up	Sample size	Natural conception	ART	Odds ratio	Significance
McKibbin, 1996	England	3 years	267	233	44	-	p>0,05 only tendency
Watts, 2000	England	3 years	179	152	27	-	p>0.05 only tendency ROP 3
Friling, 2007	Israel	2 years	363	204	159	-	P>0,05, no significance
Chan P.,2010	USA	5 years	399	253	146	4.70; [CI], 1.52–4.57	0,007 ROP 3
Şekeroğlu M., 2016	Turkey	2 years	54	18	36	-	0,674
Barker L, 2017	USA	5 years	205	125	80	-	0,837
Yau GS, 2016	China	5 years	513	---	----	2.07/CI= 0.47- 6.54	0,3 ROP 1