Pambianco 2006.

Study characteristics
Methods	Study design: prospective cohort longitudinal Location: USA Time period: baselines 1986 to 1988; follow‐up to December 2000 Outcome: PDR Outcome measurement: cumulative incidence and incidence density per 100 person‐years
Participants	Number of participants: 1124 Diabetes type: T1D Inclusion criteria: T1D diabetes; diagnosed or seen within 1 year of diagnosis at Children’s Hospital of Pittsburgh between 1 January 1950 to 31 May 1980 and living within 100 miles or 2.5 hours from Pittsburgh Exclusion criteria: no death certificate; no follow‐up for the relevant durations
Notes	Link to data extraction table, risk of bias assessment, and results: osf.io/mh9f3/?view_only=145b0dc33f5b4679ae2cad5ccabed10b
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	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