Appendix.

Sensitivity Analyses Examining the Relationships Between Number of PCC Attributes and Health Care Ratings.

	Rating of health care (0-10)M
	Coefficient (SE)
Number of PCC attributes
Usual source of care + 0 PCC attribute (reference group)	Ref.
Usual source of care + 1 PCC attribute	1.51*** (0.33)
Usual source of care + 2 PCC attributes	1.99*** (0.34)
Usual source of care + 3 PCC attributes	2.36*** (0.33)

Note. A linear regression was used to estimate health care ratings (from 0 to 10). Control variables included age, gender, race/ethnicity, marital status, educational level, employment status, census region, household per capita income, types of health insurance, whether having managed care, the number of existing chronic conditions, need for help with ADLs, need for help with IADLs, provider’s type, and provider’s location. PCC = patient-centered care; ADL = activities of daily living; IADL = instrumental activities of daily living.

^*P < .05. **P < .01. ***P < .001.