Table 2

Risk of ROP among premature infants (gestational age ≤35 weeks and birth weight ≤2000 g) included in the study (n=301)

Variable	Examined	Infants with ROP		p Value*
Variable	Count	Count	%	p Value*
Overall	301	27	9.0
Gender				0.289
Male	163	12	7.4
Female	138	15	10.9
Supplemental oxygen				0.002
Yes	228	27	11.8
No	73	0	0
Surfactant				<0.001
Yes	71	19	26.8
No	230	8	3.5
Septicaemia				<0.001
Yes	80	15	18.8
No	221	12	5.4
Birth apnoea				<0.001
Yes	57	13	22.8
No	244	14	5.7
Blood transfusions				<0.001
Yes	84	21	25.0
No	217	6	2.8
Phototherapy				0.091
Yes	214	23	10.7
No	87	4	4.6
Respiratory distress syndrome				0.009
Yes	33	7	21.2
No	268	20	7.5
Meeting international screening criteria				0.004
Yes	235	27	11.5
No	66	0	0.0