title: Analysis of risk factors for retinopathy of prematurity.
abstract: OBJECTIVE
  To analyze the incidence and risk factors for retinopathy of prematurity (ROP).
  
  
  METHODS
  A retrospective analysis was conducted on 568 premature infants from September 2005 to December 2010 with birth weight(BW) equal to or less than 2 500g or a gestational age(GA) at birth of 34 weeks or less. All of the members were examined by indirect binocular ophthalmoscopy.
  
  
  RESULTS
  ROP occurred with an incidence rate of 10.7% among 568 premature infants, and stages 3 and above ROP occurred with an incidence rate of 2.5%. This study showed the infants were more prone to develop ROP with short geststional age, low BW, long time of oxygen inhalation, and severe infants diseases. Twins had a significantly higher rate of ROP(18.3%) than singleton babies(9.8%), ROP were severer in twins than singleton babies.
  
  
  CONCLUSIONS
  Short GA, low BW, long time of oxygen inhalation, severe infants diseases, and non-singleton babies were the most significant risk factors associated with ROP.
authors.affiliation: Department of Ophthalmology, Shenzhen Children's Hospital, Shenzhen 518026, Guangdong Province, China.
authors.forename: Wen-Lin
authors.initials: WL
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: He
authors.forename: Xi-Hua
authors.initials: XH
authors.lastname: Liu
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Wang
authors.forename: Jian-Qing
authors.initials: JQ
authors.lastname: Liu