Table 6.

Summary of mediation effects

Model#	Predictor	Mediator	Outcome	Sobel’s test	Percent of total effect explained by the mediator (%)
1	Vision	Physical limitations	ADL ability	2.84*	31.8
2	Vision	Physical limitations	Immobility	−2.75*	36.4
4	Lung function	Physical limitations	ADL ability	1.98*	32.5
5	Lung function	Physical limitations	Immobility	−2.95*	38.0
8	Grip strength	Physical limitations	ADL ability	5.21*	44.0
9	Grip strength	Physical limitations	Immobility	−5.28*	52.1
10	Vision	Depression	Physical limitations	−1.77†	17.2
11	Vision	Mastery	Physical limitations	−2.26*	28.6
15	Lung function	Mastery	Physical limitations	−2.32*	27.0
18	Grip strength	Mastery	Physical limitations	−2.55*	18.6
19	Physical limitations	Depression	ADL ability	−2.18*	10.2
20	Physical limitations	Mastery	ADL ability	−3.92*	19.6
21	Physical limitations	Loneliness	ADL ability	1.88†	6.8
22	Physical limitations	Depression	Immobility	2.16*	10.1
23	Physical limitations	Mastery	Immobility	3.87*	20.1
25	Delayed recall	Loneliness	ADL ability	1.39	10.6

Note: Models 3, 6, 7, 12, 13, 14, 16, 17, and 24 had one or more portions of the mediation testing (A, B, or C) where key variables were non-significant, thus disqualifying the models from subsequent analyses of Sobel’s test or testing the % of the total effect explained by the mediator

* Statistical significance at a level of P < 0.05

^†Indicates marginal significance at a level of P < 0.10