Table 3.
Effects of tea drinking on cognitive function and cognition-related brain regions.
| Characteristics |
Tea drinkers (n = 54) |
Non-tea drinkers n = 57) |
T | P |
|---|---|---|---|---|
| Age, y | 69.67 ± 7.697 | 71.28 ± 8.079 | −1.076 | 0.284 |
| Education, y | 9.08 ± 4.300 | 8.61 ± 4.218 | 0.564 | 0.574 |
| Male, n (%) | 35 (64.8) | 37 (64.9) | 1.000 | 0.574 |
| Smoker, n (%) | 23 (42.6) | 16 (28.1) | 2.566 | 0.117 |
| Drinker, n (%) | 15 (27.8) | 8 (14.0) | 3.188 | 0.101 |
| Take exercise, n (%) | 32 (59.3) | 34 (59.6) | 0.002 | 1.000 |
| Hobby, n (%) | 37 (68.5) | 29 (50.9) | 3.580 | 0.082 |
| Hypertension, n (%) | 20 (37.0) | 21 (36.8) | 0 | 1.000 |
| Diabetes, n (%) | 7 (13.0) | 6 (10.5) | 0.159 | 0.733 |
| Brain structure | ||||
| Total brain volume, cm3 | 1485.44 ± 131.605 | 1475.91 ± 135.964 | 0.375 | 0.709 |
| Center hippocampus, mm3 | 3676.10 ± 384.162 | 3574.24 ± 472.829 | 1.242 | 0.217 |
| Right hippocampus, mm3 | 3852.21 ± 451.510 | 3783.28 ± 499.481 | 0.761 | 0.448 |
| CC_anterior, mm3 | 854.76 ± 146.967 | 879.43 ± 145.036 | −0.890 | 0.375 |
| CC_Central, mm3 | 451.85 ± 102.669 | 466.18 ± 100.002 | −0.745 | 0.458 |
| CC_posterior, mm3 | 950.42 ± 181.166 | 1023.41 ± 172.956 | −2.172 | 0.032* |
| Neuropsychological tests | ||||
| Baseline MoCA | 24.66 ± 3.937 | 23.86 ± 4.228 | 1.026 | 0.307 |
| Follow-up of MoCA | 23.61 ± 4.451 | 23.22 ± 5.357 | 0.317 | 0.752 |
| MoCA change value | 0.008 ± 0.155 | −0.049 ± 0.236 | 1.148 | 0.256 |
| Baseline ALT | 6.92 ± 3.142 | 5.68 ± 3.216 | 2.044 | 0.043* |
| Follow-up of ALT | 6.80 ± 3.008 | 6.13 ± 4.647 | 0.700 | 0.486 |
| ALT change value | −0.198 ± 0.738 | −0.404 ± 1.023 | 0.932 | 0.355 |
*
p < 0.05; CC means corpus callosum; ALT, Associative learning test.