Lloyd 1995.

Study characteristics
Methods	Study design: prospective cohort Location: USA Time period: baseline 1986 to 1988; follow‐up 1988 to 1990 Outcome: PDR Outcome measurement: incidence, mean difference, and RR
Participants	Number of participants: 496 Diabetes type: T1D Inclusion criteria: childhood‐onset < 17 years at the Hospital of Pittsburgh between January 1950 and May 1980, and living within 100 miles of Pittsburgh at the time of the study Exclusion criteria: not reported
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/shcf9/?view_only=814f3f5f86874f3d9ee5412730151dca
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	Yes	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