Table 3.
Stratified regression coefficients (95% confidence interval) for SBP change according to the total tea, green tea and black tea consumption categories (β coefficients and 95% confidence intervals) among Chinese adults (n= 1109) a
| Categories of tea consumption | |||||
|---|---|---|---|---|---|
| N | <10 g/day b | >10 g/day b | P for trend | P for interaction | |
| (7.1 g/day) c | (14.3 g/day) | ||||
| Total tea | |||||
| Central obesity | |||||
| Yes | 334 | 0.20(-7.17 to 7.57) | 0.68(-8.51 to 9.87) | 0.89 | 0.20 |
| No | 768 | -0.35(-4.18 to 3.47) | -2.81(-7.04 to 1.43) | 0.23 | |
| BMI | |||||
| >24 kg/m2 | 443 | 0.56(-5.41 to 6.52) | 0.84(-5.93 to 7.61) | 0.78 | 0.21 |
| <24 kg/m2 | 659 | 0.19(-3.92 to 4.29) | -2.97(-7.74 to 1.79) | 0.30 | |
| Sex | |||||
| Male | 469 | -0.24(-4.55 to 4.06) | -1.29(-5.82 to 3.24) | 0.60 | 0.79 |
| Female | 633 | 1.22(-4.67 to 7.1) | 0.32(-7.7 to 8.34) | 0.79 | |
| Smoking | |||||
| Yes | 310 | 0.54(-4.41 to 5.48) | 0.97(-4.14 to 6.07) | 0.71 | 0.31 |
| No | 792 | 0.66(-4.11 to 5.43) | -5.26(-11.12 to 0.6) | 0.17 | |
| Drinking | |||||
| Yes | 281 | 0.91(-4.81 to 6.63) | -0.73(-7.05 to 5.59) | 0.91 | 0.54 |
| No | 805 | 1.19(-3.41 to 5.78) | -3.51(-8.66 to 1.64) | 0.33 | |
| Green tea | |||||
| Central obesity | |||||
| Yes | 334 | 0.69(-6.47 to 7.85) | 1.39(-9.59 to 12.37) | 0.77 | 0.11 |
| No | 768 | -0.53(-4.51 to 3.46) | -5.57(-10.75 to -0.39) | 0.07 | |
| BMI | |||||
| >24 kg/m2 | 443 | -0.03(-5.95 to 5.89) | 0.37(-7.75 to 8.50) | 0.95 | 0.52 |
| <24 kg/m2 | 659 | 1.03(-3.28 to 5.34) | -4.13(-9.97 to 1.70) | 0.37 | |
| Sex | |||||
| Male | 469 | -0.36(-4.63 to 3.91) | -2.83(-8.11 to 2.45) | 0.34 | 0.90 |
| Female | 633 | 0.78(-5.44 to 6.99) | -1.84(-12.37 to 8.68) | 0.92 | |
| Smoking | |||||
| Yes | 310 | 1.19(-3.76 to 6.13) | 0.43(-5.33 to 6.2) | 0.78 | 0.052 |
| No | 792 | -0.5(-5.35 to 4.35) | -10.06(-17.75 to -2.36) | 0.038 | |
| Drinking | |||||
| Yes | 281 | -1.06(-7.07 to 4.95) | -3.06(-10.23 to 4.12) | 0.40 | 0.67 |
| No | 805 | 1.09(-3.47 to 5.66) | -4.7(-11.1 to 1.7) | 0.36 | |
| Black tea | |||||
| Central obesity | |||||
| Yes | 334 | -11.39(-25.64 to 2.87) | 6.25(-11.07 to 23.58) | 0.93 | 0.76 |
| No | 768 | -0.23(-5.85 to 5.39) | 1.06(-5.14 to 7.26) | 0.80 | |
| BMI | |||||
| >24 kg/m2 | 443 | -0.93(-11.69 to 9.83) | 1.75(-9.06 to 12.56) | 0.83 | 0.33 |
| <24 kg/m2 | 659 | -2.04(-7.95 to 3.87) | 1.55(-5.51 to 8.6) | 0.96 | |
| Sex | |||||
| Male | 469 | -2.92(-9.22 to 3.39) | 1.63(-5.01 to 8.27) | 0.95 | 0.15 |
| Female | 633 | 2.72(-7.23 to 12.67) | 8.01(-5.32 to 21.34) | 0.21 | |
| Smoking | |||||
| Yes | 310 | -3.88(-10.87 to 3.11) | 2.49(-4.9 to 9.88) | 0.88 | 0.39 |
| No | 792 | 0.42(-7.48 to 8.32) | 2.25(-7.17 to 11.66) | 0.65 | |
| Drinking | |||||
| Yes | 281 | 3.76(-4.98 to 12.49) | 3.43(-5.98 to 12.85) | 0.33 | 0.67 |
| No | 805 | -3.93(-11.24 to 3.39) | 0.43(-7.5 to 8.36) | 0.72 | |
CI, confidence interval. aModels adjusted for variables in model3 of Table 2. Stratifying variables are not adjusted for in corresponding models. bReferent category is non-tea drinkers. cMedian tea consumption.