Table 1. Demographic characteristics of participants (n = 955).
| Variables | Total (N = 955) | cognitive decline (N = 151) | normal (N = 804) | χ2/t | p |
|---|---|---|---|---|---|
| Age, mean (SD), years | 66.9(5.3) | 68.7(5.8) | 66.6(5.1) | 4.08a | <0.001 |
| Gender, male, n (%) | 446(46.7) | 36(23.8) | 410(51.0) | 37.66 b | <0.001 |
| Ethnicity, han, n (%) | 646(67.6) | 109(72.2) | 537(66.8) | 2.83 b | 0.243 |
| Residence, rural, n (%) | 479(50.2) | 88(58.3) | 391(48.6) | 4.73 b | 0.030 |
| Marital status, n (%) | 3.10 b | 0.078 | |||
| unmarried/widowed/divorced | 173(18.1) | 35(23.2) | 138(17.2) | ||
| Married | 782(81.9) | 116(76.8) | 666(82.8) | ||
| Educational attainment, mean (SD), years | 3.7(4.2) | 1.6(3.7) | 4.0(4.1) | 7.27 a | <0.001 |
| Family income, n (%) | 37.95 b | <0.001 | |||
| <1000 RMB | 505(52.9) | 111(73.5) | 394(49.0) | ||
| 1000~1999 RMB | 192(20.1) | 17(11.2) | 175(21.7) | ||
| 2000~2999 RMB | 148(15.5) | 14(9.3) | 134(16.7) | ||
| 3000~4999 RMB | 87(9.1) | 6(4.0) | 81(10.1) | ||
| ≥5000 RMB | 23(2.4) | 3(2.0) | 20(2.5) | ||
| Smoking, n (%) | 181(19.0) | 18(11.9) | 163(20.3) | 5.77 b | 0.016 |
| Alcohol use, n (%) | 126(13.2) | 5(3.3) | 121(15.0) | 15.29 b | <0.001 |
| BMI, mean (SD) | 25.8(7.9) | 25.5(4.0) | 25.8(8.3) | 0.44 a | 0.662 |
| FBG, mean (SD) | 5.1(1.6) | 5.0(1.4) | 5.1(1.6) | 0.53a | 0.599 |
| Hyperlipidemia, n (%) | 38(4.0) | 3(2.0) | 35(4.4) | 1.86 b | 0.172 |
| Hypertension, n (%) | 385(40.3) | 60(39.7) | 325(40.4) | 0.02 b | 0.874 |
| Social cohension, mean (SD) | 15.7(2.5) | 15.3(2.8) | 15.7(2.5) | 1.89 a | 0.059 |
| Social interaction, mean (SD) | 13.2(3.7) | 12.5(4.3) | 13.3(3.6) | 2.57 a | 0.010 |
| Sleep duration, mean (SD), hours | 8.1(1.5) | 9.0(1.6) | 7.9(1.4) | 7.58 a | <0.001 |
SD: standard deviation; BMI: body mass index; FBG: fasting blood glucose
a: t-test used
b: chi-square test used.