Branger 1999.

Methods	CBA Characteristics of studies using second site as control: NOT DONE Follow up: ‐ providers: DONE ‐ patients: NOT CLEAR Blinded assessment: DONE Baseline: DONE for patient contacts NOT CLEAR for recorded parameters per patient, letters send from GP to consultant and vice versa Reliable outcomes: DONE Protection against contamination: NOT CLEAR unit of analysis error
Participants	32 general practitioners in the Apeldoorn region (The Netherlands) that were working with the computer based patient record and with electronic data interchange (EDI). In addition one internal medicine consultant participated. Patients treated by the GP (Type 1 and Type 2 diabetes). providers ‐ 32 general practitioners + 1 internal medicine consultant patients ‐ 275 practices ‐ 1 hospital and ? practices
Interventions	Intervention group: Organisational intervention (changes in medical record systems) Control group: usual care without electronic data interchange between different care providers Length of intervention: 1 year
Outcomes	PROCESS: Patient contacts with GP Patient contacts with internal medicine consultant Letters from GP to consultant and vice versa Recorded items per patient: Kidney function: ‐Creatinine level ‐Proteinuria Eye condition: Assessment ophthalmologist Insulin control Glucose level HbA1c level Fructosamine level Other Blood pressure Cholesterol level Triglyceride level Weight PATIENT: NONE
Notes	Guidelines not specified in the paper
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used