Table 1.
Demographic and cognitive function of the participants
| Characteristics | MCI (n=816) | CH (n=1033) | t or χ2 | P value |
| Age (years), mean (SD) | 70.25 (8.48) | 68.90 (7.60) | 3.567 | <0.001* |
| Female (%) | 67.8 | 63.9 | 3.038 | 0.081 |
| Education (years), mean (SD) | 9.65 (4.04) | 11.12 (3.37) | −8.350 | <0.001* |
| Tea consumption (%) | 41.3 | 47.1 | 6.099 | 0.014* |
| Smoking history (%) | 16.9 | 16.5 | 0.068 | 0.794 |
| Drinking history (%) | 13.6 | 15.2 | 0.936 | 0.333 |
| Eating fish (%) | 95.8 | 96.3 | 0.561 | 0.454 |
| Hypertension history (%) | 70.2 | 66.5 | 2.499 | 0.114 |
| Diabetes mellitus history (%) | 30.3 | 26.9 | 2.226 | 0.136 |
| Heart disease history (%) | 22.9 | 17.2 | 7.967 | 0.005* |
| Hyperlipemia history (%) | 37.6 | 45.0 | 8.572 | 0.003* |
| MoCA, mean (SD) | 18.53 (4.25) | 24.45 (3.01) | −33.645 | <0.001* |
| HVLT total, mean (SD) | 13.71 (4.69) | 18.28 (4.68) | −20.821 | <0.001* |
| HVLT recall, mean (SD) | 5.94 (2.56) | 6.33 (2.48) | −20.28 | <0.001* |
| DST forward, mean (SD) | 7.28 (2.64) | 9.02 (2.40) | −14.633 | <0.001* |
| DST backward, mean (SD) | 4.47 (1.90) | 5.82 (2.11) | −14.296 | <0.001* |
*p<0.05.
CH, cognitively healthy; DST, Digit Span Test; HVLT, Hopkins Verbal Learning Test; MCI, mild cognitive impairment; MoCA, Montreal Cognitive Assessment.