. 2019 Jun 6;21(6):e12165. doi: 10.2196/12165

Table 2.

Hierarchical linear regression model examining effects of health literacy, electronic health literacy, and chronic obstructive pulmonary disease knowledge on generic health-related quality of life (centered at the mean).

Predictor		R² change	b	SE b	95% CI
Step 1		.16^a
	Age^b	—^c	.01^d	0.001	0.002 to 0.01
	Gender (0=male, 1=female)	—	.02	0.03	−0.04 to 0.07
	Race (0=nonwhite, 1=white)	—	−.01	0.02	−0.05 to 0.04
	Marital status (0=unmarried, 1=married)	—	−.01	0.01	−0.03 to 0.01
	Education (1=less than 8 years, 6=postgraduate)	—	.04^d	0.01	0.02 to 0.07
	Comorbidity (0=no, 1=yes)	—	−.06	0.03	−0.13 to 0.004
Step 2		.09^a
	COPD^e knowledge^a	—	−.01	0.01	−0.03 to 0.002
	Health literacy^a	—	.08^a	0.02	0.04 to 0.12
	Electronic health literacy^a	—	.02	0.02	−0.01 to 0.06
Total R²		.25^a	—	—	—
Adjusted R²		.21^a	—	—	—

^aP<.001.

^bCentered at the mean.

^cNot applicable.

^dP<.01.

^eCOPD: chronic obstructive pulmonary disease.