Teuscher 1988.

Study characteristics
Methods	Study design: prospective cohort longitudinal Location: Switzerland Time period: baseline 1974 to 1975; follow‐up 1982 to 1983 Outcome: PDR Outcome measurement: incidence
Participants	Number of participants: 534 Diabetes type: T1D and T2D Inclusion criteria: age range 35 to 54 years; diagnosed at least 1 year earlier and under treatment for the disorder by the physicians of the participating centre at a defined date  Exclusion criteria: specialist clinics known to attract patients referred, for example, because of particular complications of diabetes
Notes	Eligibility criteria extracted from 'Prevalence of small vessel and large vessel disease in diabetic patients from 14 centres' (Teuscher 1988, secondary reference). Link to data extraction table, risk of bias assessment, and results: osf.io/bvgws/?view_only=cd78263931c044808acad3e64538ce3c
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	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