Hayes 1984.

Study characteristics
Methods	Randomised controlled trial of routine hospital clinic care versus routine general practice care for type II diabetics Patient RCT, conducted in diabetic clinics from a hospital in Wales, UK Two arms: 1. General practice (control arm) and 2. Hospital (intervention arm)
Participants	Control arm N: 103 Intervention arm N: 97 Diabetes type: type 2 Mean age: 59.0 ± 8.2 % Male: 41.0 Longest follow‐up: 60 months
Interventions	Control arm: 1) Clinician education Intervention arm: 1) Team changes
Outcomes	1) HbA1c, mean % (SD) Control arm: pre NR (NR), post 10.4 (1.7) Intervention arm: pre NR (NR), post 9.5 (1.8)
Funding source	The trial was financed by a grant from the Office of the Chief Scientist, Department of Health and Social Security
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Information not available.
Allocation concealment (selection bias)	Unclear risk	Information not available.
Patient's baseline characteristics (selection bias)	High risk	Information not available.
Patient's baseline outcomes (selection bias)	Low risk	Information not available.
Incomplete outcome data (attrition bias)	Low risk	Information not available.
Blinding of participants and personnel (performance bias) and of outcome assessors (detection bias)	Low risk	Information not available.
Selective reporting (reporting bias)	Unclear risk	Information not available.
Risk of contamination (other bias)	Low risk	Information not available.
Other bias	Low risk	Information not available.