Table 4.

Risk factor for retinopathy of prematurity in other studies

Study details	GA (weeks)	BW (gr)	Risk factors
Reyes et al., 2017. Oman [46]	< 32	< 1500	low BW, low GA, duration of invasive ventilation, duration of oxygen therapy, duration of nasal CPAP, late onset clinical or proven sepsis
Shah et al., 2005 Singapore [40]	< 32	< 1500	Preeclampsia, low BW, prolonged duration of ventilation, pulmonary hemorrhage and CPAP
Yau et al., 2016, China [45]	< 32 and > 32	< 1500	low GA, low BW, preeclampsia, gestational diabetes mellitus, inotrope use, postnatal hypotension, apgar score (1 min, 5 min and 10 min), respiratory distress syndrome, bronchopulmonary dysplasia, invasive mechanical ventilation, surfactant use, oxygen supplement, patent ductus arteriosus, thrombocytopenia, blood transfusion, anemia, NSAID use, sepsis
Abdel HA et al., 2012, Egypt [34]	< 32 and > 32	< 1500 and > 1500	low GA, oxygen therapy, frequency of blood transfusions and sepsis
Chen et al., 2011, USA [41]	< 30	< 1500	low GA, Sepsis, oxygen exposure
Hadi and Hamdy, 2013, Egypt [37]	< 32	< 1250	low GA, low BW, Ventilation, blood transfusions, sepsis, Patent ductus arteriosus, IVH
Nair et al., 2001, Oman [36]	< 32	< 1500	low BW, Low GA, TPN

BW Birth weight, GA Gestational age, PDA Patent ductus arteriosus, CPAP Continuous positive pressure ventilation, IVH Intraventricular hemorrhage, TPN Total parenteral nutrition