Table 2. Correlation matrix between SC, sleep duration, and MMSE score (n = 955)a.
| Mean | SD | 1 | 2 | 3 | 4 | |
|---|---|---|---|---|---|---|
| 1.MMSE | 23.6 | 5.4 | 1 | |||
| 2.Social cohension | 15.7 | 2.5 | 0.12** | 1 | ||
| 3.Social interaction | 13.2 | 3.7 | 0.09* | 0.46** | 1 | |
| 4.Sleep duration | 8.1 | 1.5 | -0.24** | -0.11* | -0.05 | 1 |
**p<0.001
*p<0.05, SD = standard deviation
a: The covariates include age, gender, ethnicity, residence, educational attainment, marital status, family income, BMI, smoking, alcohol use, FBG, hyperlipidemia, hypertension were adjusted using Partial correlation method.