Table 4. The mediating effect of sleep duration on the relationship between SC and cognitive decline ^*.

Effect				Bias-Corrected 95%CI
	β	SE	P-value	Lower	Upper
Social cohesion
Total effect	0.207	0.058	<0.001	0.093	0.332
Indirect Effects	0.045	0.016	0.002	0.018	0.082
Direct Effects	0.162	0.057	0.004	0.050	0.275
Social interaction
Total effect	0.104	0.039	0.007	0.026	0.181
Indirect Effects	0.004	0.002	0.133	-0.001	0.009
Direct Effects	0.090	0.038	0.019	0.015	0.165

*After controlling for age, gender, ethnicity, residence, educational attainment, marital status, family income, BMI, smoking, alcohol use, FBG, hyperlipidemia, hypertension.