Table 1.
Clinical characteristics of study subjects.
| Clinical Characteristic | |
|---|---|
| Number of subjects | 12 |
| Age, mean ± SD (range) | 88 ± 7.6 (70–98) |
| Sex, n (%) | |
| Men | 2 (16.7) |
| Women | 10 (83.3) |
| Underlying disease, n (%) | |
| Alzheimer’s disease | 3 (25.0) |
| Vascular dementia | 8 (66.7) |
| Dementia with Lewy bodies | 1 (8.3) |
| MMSE-J score, n (%) | |
| 24–27 (MCI) | 2 (16.7) |
| 10–23 (mild to moderate) | 6 (50.0) |
| 0–9 (severe) | 4 (33.3) |
| Complication a, n (%) | |
| Hypertension | 8 (66.7) |
| Diabetes | 2 (16.7) |
| Hyperuricemia | 1 (8.3) |
| Concomitant drug a, n (%) | |
| Antihypertensive drug | 8 (66.7) |
| Drug for hyperuricemia | 2 (16.7) |
| Antidiabetic drug | 1 (8.3) |
| Drug for dementia | 1 (8.3) |
| Activities of daily living | |
| Independence | 0 (0.0) |
| Some assistance is necessary | 12 (100) |
| Usual tea consumption | |
| Green tea, n (%) | 12 (100) |
| Mean ± SD, mL/day | 680 ± 229.8 |
| Others b, n (%) | 8 (66.7) |
| Mean ± SD, mL/day | 85 ± 63.7 |
| Alcohol use, n (%) | 0 (0.0) |
| Smoking, n (%) | 2 (16.7) |
| Dietary supplements, n (%) | 0 (0.0) |
MMSE-J, Mini-Mental State Examination Japanese version; MCI, Mild cognitive impairment. a More than one choice was possible, b black tea or oolong tea.