Dwyer 1985.

Study characteristics
Methods	Study design: registry data Location: USA Time period: diagnosed 1945 to 1969, followed until December 1981 Outcome: PDR Outcome measurement: incidence
Participants	Number of participants: 1135 Diabetes type: T1D and T2D Inclusion criteria: new DM diagnosis 1945 to 1969 Exclusion criteria: not reported
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/w2mq9/?view_only=d23bc4f8bf7045c3a5089f140af86fa2
Item	Authors' judgement	Support for judgement
Study participation	Unclear	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	Unclear	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	Unclear	See ‘Notes’ above for link to risk of bias assessment