Table 1.

Study design and number of practice groups/number of physicians

	Randomized		Included in the analysis (saw at least one patient with diabetes during the follow-up year)
Intervention	Number of practice groups	Number of physicians	Number of practice groups	Number of physicians
1. informed only (no PEM*)	1,077	1,318	1,051	1,282
2. informed plus insert	1,066	1,305	1,042	1,273
3. informed plus outsert
a. No patient reminder notepad	535	642	519	623
b. Patient reminder notepad	536	643	523	629
4. informed plus insert & outsert
No patient reminder notepad	535	632	527	620
Patient reminder notepad	533	639	519	621
Total	4,282	5,179	4,181	5,048

*PEM: Printed Educational Message.