Appendix 1.

Correlation Matrix for Psychosocial Factors Included in PCA.

	Grit	Optimism	Personal mastery	Successful aging	Depression score	Perceived stress	Negative interactions	Emotional Support	Duke social support
Grit	1.00
Optimism	0.60	1.00
Personal mastery	0.47	0.65	1.00
Successful aging	0.47	0.53	0.55	1.00
Depression score	−0.49	−0.41	−0.46	−0.39	1.00
Perceived stress	−0.59	−0.70	−0.76	−0.64	0.58	1.00
Negative interactions	−0.21	−0.25	−0.24	−0.17	0.22	0.36	1.00
Emotional support	0.15	0.33	0.33	0.29	−0.09	−0.24	−0.16	1.00
Duke social support	0.19	0.28	0.26	0.28	−0.29	−0.31	−0.09	0.36	1.00