Grant 2008.

Study characteristics
Methods	Practice‐linked online personal health records for type 2 diabetes mellitus: a randomized controlled trial Cluster‐RCT (11 clusters), conducted in primary care practices in hospital and community‐based settings in eastern Massachusetts, USA Two arms: 1. Active control arm (control arm) and 2. Intervention arm (intervention arm)
Participants	Control arm N: 118 Intervention arm N: 126 Diabetes type: type 2 Mean age: 56.1 ± 11.6 % Male: 51.0 Longest follow‐up: 12 months
Interventions	Control arm: None Intervention arm: 1) Electronic patient registry 2) Facilitated relay of clinical information 3) Promotion of self‐management
Outcomes	1) HbA1c
Funding source	This study was supported in part by a grant from the Agency for Healthcare Research and Quality (AHRQ R01 HS013660‐02: Shared Online Health Records for Patient Safety and Care). Dr Grant is also supported by a National Institute of Diabetes and Digestive and Kidney Diseases Career Development Award (K23DK067452)
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Information not available.
Allocation concealment (selection bias)	Low risk	Cluster‐RCT.
Provider's baseline characteristics (selection bias)	High risk	Not reported
Patient's baseline characteristics (selection bias)	High risk	Table ‐ P values < 0.05 for age, sex, race.
Patient's baseline outcomes (selection bias)	Low risk	Table ‐ outcomes P < 0.05 for study participants.
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)	Low risk	Information not available.
Risk of contamination (other bias)	Low risk	Information not available.
Other bias	Low risk	Information not available.