Table 3.

Linear regression model for predicting the number of times that the patient used the voice interface technology, with an added interaction term.

Variable	Coefficient	95% CI	P value
Intercept	43.45	2.54 to 84.36	.04
Age	1.07	0.37 to 1.78	.004
Black	−21.35	−39.19 to −3.50	.02
Household income higher than US $100,000	15.19	−2.87 to 33.24	.10
Household income lower than US $25,000	−3.89	−26.61 to 18.83	.73
Number of medications to manage HFa	−6.52	−10.33 to −2.70	.002
Avatar study participant	−32.38	−54.70 to −10.06	.006
Avatar×income lower than US $25,000	44.81	2.44 to 87.18	.04

^aHF: heart failure.