Table 2 |
|||||||
| Participant characteristics by frequency of green tea intake | |||||||
| Less than weekly intake (< once per week) | Weekly intake (1-6 times per week) | Daily intake (7+ times per week) | P value* | ||||
| mean | s.d. | mean | s.d. | mean | s.d. | ||
| Age (y)* | 45.4 | 6.8 | 48.3 | 8.2 | 49.7 | 7.0 | 0.01 |
| Body Mass Index (kg / m2) | 21.9 | 3.3 | 22.0 | 3.1 | 21.0 | 2.8 | 0.18 |
| n | row % | n | row % | n | row % | ||
| Menopausal status / menstrual phase | 0.049 | ||||||
| Premenopausal women in luteal phase | 62 | 52.1% | 32 | 26.9% | 25 | 21.0% | |
| Postmenopausal | 25 | 34.7% | 23 | 31.9% | 24 | 33.3% | |
| Study center, n (%) | 0.01 | ||||||
| Hawaii | 70 | 55.1% | 34 | 26.8% | 23 | 18.1% | |
| Los Angeles | 7 | 21.9% | 13 | 40.6% | 12 | 37.5% | |
| San Francisco | 10 | 31.3% | 8 | 25.0% | 14 | 43.8% | |
| Combined parity and age at first birth, n (%) | 0.07 | ||||||
| Nulliparous | 12 | 42.9% | 8 | 28.6% | 8 | 28.6% | |
| 1st birth age ≤ 20 y | 7 | 63.6% | 4 | 36.4% | 0 | .0% | |
| 1-2 live births / age ≥ 21 | 53 | 52.5% | 23 | 22.8% | 25 | 24.8% | |
| 3+ live births / age ≥ 21 | 15 | 29.4% | 20 | 39.2% | 16 | 31.4% | |
| Age at menarche, n (%) | <0.001 | ||||||
| ≥ 12 y | 56 | 54.9% | 34 | 33.3% | 12 | 11.8% | |
| > 12 y | 31 | 34.8% | 21 | 23.6% | 37 | 41.6% | |
| Born in Asia, n (%) | <0.001 | ||||||
| No | 74 | 49.3% | 49 | 32.7% | 27 | 18.0% | |
| Yes | 13 | 31.7% | 6 | 14.6% | 22 | 53.7% | |
| Soy intake (frequency of weekly intake), n (%) | <0.001 | ||||||
| 0-0.5 times weekly | 31 | 66.0% | 12 | 25.5% | 4 | 8.5% | |
| 0.5-1 times weekly | 27 | 47.4% | 20 | 35.1% | 10 | 17.5% | |
| > once weekly | 29 | 33.3% | 23 | 26.4% | 35 | 40.2% | |
| Black tea (frequency of weekly intake), n (%) | 0.21 | ||||||
| < once weekly | 69 | 50.7% | 34 | 25.0% | 33 | 24.3% | |
| 1-6 times weekly | 12 | 32.4% | 15 | 40.5% | 10 | 27.0% | |
| 7+ times weekly | 6 | 33.3% | 6 | 33.3% | 6 | 33.3% | |
| Coffee (frequency of weekly intake), n (%) | 0.75 | ||||||
| 0-2 times weekly | 22 | 53.7% | 11 | 26.8% | 8 | 19.5% | |
| 3-13 times weekly | 25 | 41.0% | 18 | 29.5% | 18 | 29.5% | |
| ≥14 times weekly | 40 | 44.9% | 26 | 29.2% | 23 | 25.8% | |
| Caffeine (weekly intake in mg), n (%) | 0.83 | ||||||
| 0-734 | 29 | 50.0% | 15 | 25.9% | 14 | 24.1% | |
| 734-1609 | 27 | 47.4% | 15 | 26.3% | 15 | 26.3% | |
| ≥1610 | 31 | 40.8% | 25 | 32.9% | 20 | 26.3% | |
* For continuous covariates, p-values were obtained using ANOVA and reflect significance of differences between means by categories of green tea intake. For categorical covariates, p-values were obtained using Chi Square tests and reflect differences in distribution.
Fuhrman et al. Nutrition Journal 2013 12:25 doi:10.1186/1475-2891-12-25
