Table 1.

Descriptive Characteristics of Participating Health Plans

Plan	Commercial, Medicaid, or Both	Number of Members	Percent of Non-White Pediatric Members (if known)	Census Regiona	Urban, Rural, or Both	Plan Type and Model (Group/Staff, IPA/Network/Mixed, Other)b	Interview Participantsc
1	Medicaid	Not reported	Unknown	West	Urban	HMO: IPA/Network/Mixed	QI Staff
2	Medicaid	5,479	95%	Northeast	Urban	HMO: IPA/Network/Mixed	QI Staff
3	Both:
	Commercial	10,410	Unknown	West	Urban	HMO/POS: Group/Staff	QI, Immunization & Pediatric Program Staff
	Medicaid	53,200				HMO: Group/Staff	QI, Immunization & Pediatric Program Staff
4	Medicaid	16,793	33%	Midwest	Both	HMO: IPA/Network/Mixed	QI Staff
5	Commercial	81,086	Unknown	Northeast	Both	HMO: IPA/Network/Mixed	QI Staff
6	Commercial	126,878	8%	Midwest	Both	HMO/POS:IPA/Network/Mixed	QI & Immunization Program Staff
7	Both:
	Commercial	159,416	79%	West	Urban	HMO: IPA/Network/Mixed	QI, Immunization & Pediatric Program Staffd
	Medicaid	24,411	89%			HMO: IPA/Network/Mixed	QI, Immunization & Pediatric Program Staffd
8	Medicaid	161,336	Unknown	Northeast	Not reported	HMO (model not reported)	QI Staff
9	Commercial	2,541,871	Unknown	West	Both	HMO: Othere	QI & Immunization Program Staff
10	Commercial	2,734,938	63%	West	Both	HMO: Othere	Pediatric Program & Other Practice Staff

^aU.S. Census Bureau. Geographic Terms and Concepts – Census Divisions and Census Regions. There are four census regions—Northeast, Midwest, South, and West. Available at: https://www.census.gov/geo/reference/gtc/gtc_census_divreg.html.

^bHMO=Health Maintenance Organization; POS=Point of Service; IPA=Independent Practice Association.

^cQI=Quality Improvement.

^dPlan #7 interview participants also included OB/GYN staff.

^eIndicates that the plan defined itself as an Integrated Healthcare Delivery System.