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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

From: Tea consumption is inversely related to 5-year blood pressure change among adults in Jiangsu, China: a cross-sectional study

Categories of tea consumption
  N <10 g/dayb >10 g/dayb 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  
  1. 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.