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

Table 7.

Moderating effect of chronic obstructive pulmonary disease knowledge on the relationship between electronic health literacy and lung-specific health-related quality of life.

Predictor		R² change	b	SE b	95% CI
Step 1		.23^a	—^b	—	—
	Age^c	—	0.21^a	0.05	0.11 to 0.31
	Gender (0=male, 1=female).	—	0.72	0.98	−1.22 to 2.66
	Race (0=nonwhite; 1=white)	—	−0.64	0.82	−2.25 to 0.97
	Marital status (0=unmarried, 1=married)	—	−0.21	0.37	−0.95 to 0.53
	Education (1=less than 8 years, 6=postgraduate)	—	1.87^a	0.47	0.94 to 2.80
	Comorbidity (0=no, 1=yes)	—	−2.85^d	1.20	−5.21 to –0.49
Step 2		.05^e	—	—	—
	COPD^f knowledge^c	—	−0.56	0.29	−1.13 to 0.02
	Electronic health literacy^c	—	1.99^e	0.66	0.69 to 3.29
Step 3		.002	—	—	—
	COPD knowledge electronic health literacy	—	−.025	0.40	−1.04 to 0.54
Total R²		.28^a	—	—	—
Adjusted R²		.24^a	—	—	—

^aP<.001.

^bNot applicable.

^cCentered at the mean.

^dP<.05.

^eP<.01.

^fCOPD: chronic obstructive pulmonary disease.