Table 2.

Pearson Correlation Matrix of Baseline Social Isolation, Sleep Disturbance, and Cognitive Functioning

Variables	1	2	3	4	5	6	7	8	9
1. Social isolation in 2006	---
2. Social isolation in 2010	0.48***	---
3. Social isolation in 2014	0.44***	0.49***	---
4. Sleep disturbance in 2006	0.05***	0.04**	0.07**	---
5. Sleep disturbance in 2010	0.08***	0.05**	0.07**	0.50***	---
6. Sleep disturbance in 2014	0.07***	0.04**	0.06**	0.46***	0.50***	---
7. Cognitive functioning in 2006	−0.14***	−0.17***	−0.14***	−0.04**	−0.04*	−0.07***	---
8. Cognitive functioning in 2010	−0.13***	−0.20***	−0.16***	−0.04**	−0.06*	−0.08***	0.45***	---
9. Cognitive functioning in 2014	−0.10***	−0.18***	−0.17***	−0.05**	−0.07***	−0.07***	0.47***	0.48***	---

Note: 

*p < .05, 

^** p < .01, 

^*** p < .001.