Table 1.
Descriptions of the study sample by tea consumption at baseline
| Baseline characteristics | Tea drinkers (N=660) | Non-tea drinkers (N=297) | P |
|---|---|---|---|
| MMSE1 total score at baseline, mean (SD) | 28.5 (1.32) | 28.3 (1.31) | 0.012 |
| MMSE total score at 5 year follow-up | 28.8 (1.63) | 28.4 (2.04) | 0.007 |
| Age, mean (SD) | 64.5 (6.79) | 64.6 (6.77) | 0.78 |
| Female (%) | 371 (56.2) | 219 (73.7) | <0.001 |
| Education: Primary and below (%) | 250 (38.0) | 160 (54.1) | <0.001 |
| Current and ex-smoker (%) | 100 (15.2) | 41 (13.9) | 0.59 |
| Current alcohol drinker (%) | 96 (14.6) | 20 (6.7) | 0.001 |
| Body Mass Index2 | 23.6 (3.29) | 23.3 (3.77) | 0.21 |
| Hypertension3 (%) | 332 (50.3) | 152 (51.2) | 0.80 |
| Diabetes mellitus4 (%) | 93 (14.1) | 38 (12.8) | 0.60 |
| Heart disease (%) | 31 (4.7) | 14 (4.7) | 0.99 |
| History of stroke (%) | 21 (3.2) | 7 (2.4) | 0.48 |
| APOE ɛ4 carrier (%) | 128 (20.6) | 49 (17.7) | 0.31 |
| Depression5 (%) | 65 (9.8) | 35 (11.8) | 0.37 |
| Physical activities score, mean (SD) | 2.84 (1.94) | 2.43 (2.06) | 0.003 |
| Social and productive activities score, mean (SD) (SD) | 7.61 (3.55) | 7.32 (3.32) | 0.23 |
| Eat a lot of vegetable and fruits6 (%) | 620 (94.2) | 277 (93.9) | 0.84 |
| Eat a lot of fsh (%)7 | 582 (90.7) | 251 (86.3) | 0.044 |
| Coffee daily (%) | 418(63.4) | 196 (66.0) | 0.44 |
1. Mini-Mental State Examination; 2. Weight (kg)/height (m)2; 3. Defned as systolic blood pressure of >140 mm Hg or diastolic blood pressure of >90 mm Hg or a history of treatment for hypertension; 4. Defned as a fasting blood glucose concentration of ≥7.0 mmol/L or a history of treatment for diabetes mellitus; 5. Defned as Geriatric Depression Scale total score ≥5; 6. At least one serving everyday; 7. At least 3 times a week; P values were calculated using student t test for continuous variables and chi-squared test for categorical variables.