This was a retrospective, matched case-control study that aimed to investigate sROP in VLBW infants. Inclusion criteria for both cases and controls were VLBW (i.e. ≤ 1,500 g) infants with GA < 32 weeks born in National University Hospital, Singapore, from January 2001 to December 2013, who survived till their first ophthalmological examination at six weeks or > 36 weeks, as per the Royal College of Ophthalmologists (RCO) guidelines. The study was approved by the National Healthcare Group
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