Table 3.

Multiple linear regression analyses.

Variable		Model 1a		Model 2b		Model 3c
		β (95% CI)	P value	β (95% CI)	P value	β (95% CI)	P value
Primary outcome analysis
	Digital literacy score	1.99 (1.02 to 2.95)	<.001	1.91 (0.93 to 2.89)	<.001	1.90 (0.91 to 2.90)	<.001
Domain-level analyses
	Social domain	0.34 (0.09 to 0.61)	.009	0.35 (0.09 to 0.61)	.009	0.35 (0.08 to 0.61)	.01
	Instrumental domain	0.66 (0.23 to 1.10)	.003	0.71 (0.26 to 1.15)	.002	0.70 (0.24 to 1.15)	.003
	Reassurance domain	0.32 (0.06 to 0.59)	.02	0.30 (0.03 to 0.57)	.03	0.32 (0.05 to 0.60)	.02
	Pastime domain	0.30 (–0.02 to 0.62)	.06	0.29 (–0.05 to 0.64)	.10	0.28 (–0.06 to 0.63)	.11

^aModel 1: group (control [reference group] / intervention), baseline domain score.

^bModel 2: predictors in Model 1 and age, gender, education, housing type and living arrangement at baseline.

^cModel 3: predictors in Model 2 and social isolation (Lubben Social Network Scale-6) and loneliness (University of California, Los Angeles 3-item loneliness scale) at baseline.