title: [An epidemiological study on diabetic retinopathy among type 2 diabetic patients in Shanghai].
abstract: OBJECTIVE
  To investigate the prevalence and risk factors of diabetic retinopathy (DR) among type 2 diabetic patients aged over 30 in Shanghai central area.
  
  
  METHODS
  1039 patients diagnosed with type 2 diabetes mellitus (DM) aged over 30 were investigated by randomized cluster sampling in Shanghai central area and data from 767 of those patients were analyzed.
  
  
  RESULTS
  (1) Among all of the 1534 digital ocular fundus images from 767 patients, 87.6% of the images from 672 patients were gradable. (2) Among all of the 672 patients with gradable ocular fundus images, the prevalence of non-proliferative diabetic retinopathy (NPDR) was 21.6%, while proliferative diabetic retinopathy (PDR) was 1.3%. The rates of mild, moderate and severe NPDR were 8.8%, 11.2% and 1.6% respectively. (3) DR patients were characterized with elder age, higher HbA1c, urea nitrogen and serum creatinine. DM duration and the level of fasting plasma glucose were risk factors for DR.
  
  
  CONCLUSIONS
  The overall prevalence of DR in type 2 diabetic patients aged over 30 in Shanghai central area was 22.9% and the DR risk factors were found to include duration of diabetes and fasting plasma glucose level.
authors.affiliation: Department of Endocrinology and Metabolism, Huashan Hospital, Institute of Endocrinology and Diabetology, Fudan University, Shanghai 200040, China.
authors.forename: Hai-Ying
authors.initials: HY
authors.lastname: Hu
authors.forename: Bin
authors.initials: B
authors.lastname: Lu
authors.forename: Zhao-Yun
authors.initials: ZY
authors.lastname: Zhang
authors.forename: Lin-Yu
authors.initials: LY
authors.lastname: Mao
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Song
authors.forename: Xue-Hong
authors.initials: XH
authors.lastname: Dong
authors.forename: Ye-Hong
authors.initials: YH
authors.lastname: Yang
authors.forename: Li-Nuo
authors.initials: LN
authors.lastname: Zhou
authors.forename: Yi-Ming
authors.initials: YM
authors.lastname: Li
authors.forename: Nai-Qing
authors.initials: NQ
authors.lastname: Zhao
authors.forename: Xi-Xing
authors.initials: XX
authors.lastname: Zhu
authors.forename: Xuan-Chun
authors.initials: XC
authors.lastname: Wang
authors.forename: Hong-Ying
authors.initials: HY
authors.lastname: Ye
authors.forename: Ren-Ming
authors.initials: RM
authors.lastname: Hu
mesh_terms: D000368:Aged; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D003924:Diabetes Mellitus, Type 2 / Q000150:complications*; D003930:Diabetic Retinopathy / Q000453:epidemiology*; D016021:Epidemiologic Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors