Kim 1998.

Study characteristics
Methods	Study design: prospective cohort longitudinal Location: South Korea Time period: Recruitment 1990 to 1991 Outcome: PDR Outcome measurement: incidence, means of progressors versus non‐progressors to PDR, and RR
Participants	Number of participants: 56 Diabetes type: T2D Inclusion criteria: individuals attending a university hospital (the Asan Medical Center) in Seoul, Korea; NIDDM diagnosis based on clinical characteristics that included no episodes of ketoacidosis, a diagnosis of diabetes after 30 years of age and treatment by diet and/or oral hypoglycaemic agents, or fasting serum C‐peptide values > 0.30 nmol/L in patients using insulin Exclusion criteria: not reported
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/daecn/?view_only=9a57929592c24d4588ba5646c089e6d1
Item	Authors' judgement	Support for judgement
Study participation	Unclear	See ‘Notes’ above for link to risk of bias assessment
Study attrition	Unclear	See ‘Notes’ above for link to risk of bias assessment
Prognostic factor measurement	Unclear	See ‘Notes’ above for link to risk of bias assessment
Outcome measurement	Unclear	See ‘Notes’ above for link to risk of bias assessment
Adjustment for other prognostic factors	Unclear	See ‘Notes’ above for link to risk of bias assessment
Statistical analysis and reporting	Yes	See ‘Notes’ above for link to risk of bias assessment