Table 2. Association of initial public- and private-sector prices of immunization series with year of licensure in United States.

	β coefficient from regression analysis	R2 from regression model	p value
Year of licensure as a predictor of initial public-sector price for immunization series	14.01	0.17	0.16
Year of licensure as a predictor of initial private-sector price for immunization series	15.17	0.13	0.13