Table 1. Descriptive Characteristics of Medicare Advantage Plans Represented by Study Participants^a .

Organization	Plan Scope	Star Ratingb	Enrollment, No.c
1	Regional	<3	<50 000
2	National	3-4	≥3 Million
3	Regional	3-4	100 000-250 000
4	Regional	3-4	50 000-100 000
5	National	3-4	<50 000
6	National	3-4	>3 Million
7	Regional	>4	50 000-100 000
8	Regional	>4	50 000-100 000
9	Regional	Newd	<50 000
10	Regional	>4	100 000-250 000
11	Regional	>4	100 000-250 000
12	Regional	>4	100 000-250 000
13	Regional	>4	<50 000
14	National	3-4	250 000-500 000
15	Regional	>4	50 000-100 000
16	National	3-4	250 000-500 000
17	Regional	>4	100 000-250 000

^aPlan characteristics have been rounded and organizations are identified by numbers assigned for this study to protect plan anonymity.

^bStar ratings were identified based on 2018 publicly reported US Centers for Medicare & Medicaid Services star rating data.

^cPlan enrollment is the total enrollment from all plans owned by the organization in 2018 from publicly available contract enrollment files.

^dNew plans are not eligible for a star rating until they have been active for at least 3 years.