Table 2

Characteristics of Participating Clinicians, MAs, and Offices

Characteristic	Office 1	Office 2	Office 3	Office 4	Office 5
Clinicians^a
Number	2	3	1	3	2
Sex, % women	50	33	100	33	100
Age, mean, y	44	51	30	34	55
Race, % white	0	66	100	100	100
Mean years as clinician	13	27	2	7	13
Mean years at this office	12	19	1	2	9
MAs
Number	5	4	5	2	3
Sex, % women	100	100	100	100	100
Age, mean, y	55	45	58	32	53
Race, % white	60	100	80	0	100
Certified (CMA or RMA), %	25	66	25	0	50
Mean years as MA	13	13	29	1	16
Mean years at this office	5	9	5	1	8
Offices
Ownership of practice	Physician	Health system	Health system	Health system	Physician
Patient composition, %
Medicare	16	25	55	15	15
Medicaid/uninsured	16	1	2	51	5
Private insurance	68	74	43	34	80
Office location	Rural/suburban	Urban	Suburban	Urban	Rural/suburban

CMA = certified medical assistant; MA = medical assistant; RMA = registered medical assistant.
↵a Physicians and nurse practitioners.