Table 1

Demographic and cognitive function of the participants

CharacteristicsMCI (n=816)CH (n=1033)t or χ2P value
Age (years), mean (SD)70.25 (8.48)68.90 (7.60)3.567<0.001*
Female (%)67.863.93.0380.081
Education (years), mean (SD)9.65 (4.04)11.12 (3.37)−8.350<0.001*
Tea consumption (%)41.347.16.0990.014*
Smoking history (%)16.916.50.0680.794
Drinking history (%)13.615.20.9360.333
Eating fish (%)95.896.30.5610.454
Hypertension history (%)70.266.52.4990.114
Diabetes mellitus history (%)30.326.92.2260.136
Heart disease history (%)22.917.27.9670.005*
Hyperlipemia history (%)37.645.08.5720.003*
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.