Jeng 2016.

Study characteristics
Methods	Study design: registry data/case‐control study Location: Taiwan Time period: 01 January 2000 to 31 December 2010 Outcome: PDR Outcome measurement: cumulative incidence, incidence per 1000 person‐years, and HR
Participants	Number of participants: 53453 Diabetes type: unclear Inclusion criteria: diabetic nephropathy (DN) cohort: ≥ 18‐year old patients with DM plus DN diagnosed between 01 January 2000 to 31 December 2010. Non‐DN cohort: diagnosis of DN not made during 01 January 2000 to 31 December 2010. Exclusion criteria: not reported
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/h95wu/?view_only=e18a5b64b3244a3987aa4520c779ee54
Item	Authors' judgement	Support for judgement
Study participation	No	See ‘Notes’ above for link to risk of bias assessment
Study attrition	No	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	No	See ‘Notes’ above for link to risk of bias assessment
Adjustment for other prognostic factors	No	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