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Table 4 Stratified regression coefficients (95% confidence interval) for DBP 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 0.55(-3.55 to 4.65) 0.03(-5.08 to 5.13) 0.91 0.32
No 768 -1.72(-4.03 to 0.60) -2.94(-5.50 to -0.37) 0.02  
BMI      
>24 kg/m2 443 -1.24(-4.57 to 2.08) -2.29(-6.06 to 1.48) 0.20 0.64
<24 kg/m2 659 -0.93(-3.43 to 1.57) -2.78(-5.68 to 0.12) 0.06  
Sex      
Male 469 -1.92(-4.58 to 0.74) -2.88(-5.69 to -0.08) 0.03 0.56
Female 633 0.06(-3.28 to 3.4) -0.49(-5.04 to 4.07) 0.88  
Smoking      
Yes 310 0.76(-2.43 to 3.94) -0.57(-3.86 to 2.71) 0.81 0.03
No 792 -2.43(-5.15 to 0.29) -4.65(-7.98 to -1.32) <0.01  
Drinking   `    
Yes 281 0.61(-2.88 to 4.1) -0.9(-4.77 to 2.96) 0.76 0.52
No 805 -1.25(-3.86 to 1.35) -2.84(-5.77 to 0.08) 0.047  
Green tea      
Central obesity      
Yes 334 -0.2(-4.18 to 3.77) 2.05(-4.04 to 8.15) 0.65 0.09
No 768 -1.88(-4.29 to 0.52) -5.41(-8.54 to -2.28) <0.01  
BMI      
>24 kg/m2 443 -1.64(-4.94 to 1.66) -1.73(-6.25 to 2.79) 0.289 0.64
<24 kg/m2 659 -0.9(-3.52 to 1.72) -5.13(-8.67 to -1.58) 0.01  
Sex      
Male 469 -1.81(-4.44 to 0.82) -4.13(-7.39 to -0.87) <0.01 0.85
Female 633 -1.09(-4.62 to 2.43) -1.69(-7.66 to 4.27) 0.43  
Smoking      
Yes 310 0.82(-2.36 to 4) -1.46(-5.17 to 2.25) 0.61 <0.01
No 792 -3.43(-6.19 to -0.68) -7.6(-11.96 to -3.24) <0.01  
Drinking      
Yes 281 -1.03(-4.7 to 2.64) -3.52(-7.87 to 0.83) 0.12 0.91
No 805 -1.18(-3.77 to 1.4) -4.13(-7.76 to -0.5) 0.03  
Black tea      
Central obesity      
Yes 334 -8.16(-15.99 to -0.32) 7.35(-2.22 to 16.93) 0.78 0.77
No 768 -1.55(-4.96 to 1.85) 2.44(-1.32 to 6.2) 0.48  
BMI      
>24 kg/m2 443 -2.45(-8.44 to 3.55) -1.73(-7.76 to 4.3) 0.41 0.70
<24 kg/m2 659 -2.56(-6.15 to 1.02) 5.01(0.73 to 9.29) 0.20  
Sex      
Male 469 -2.68(-6.58 to 1.22) 2.45(-1.66 to 6.56) 0.62 0.32
Female 633 -1.02(-6.66 to 4.61) 7.25(-0.3 to 14.81) 0.17  
Smoking      
Yes 310 -2.61(-7.1 to 1.89) 3.31(-1.44 to 8.06) 0.46 0.95
No 792 -1.85(-6.36 to 2.65) 2.49(-2.88 to 7.86) 0.70  
Drinking      
Yes 281 1.75(-3.56 to 7.05) 5.01(-0.85 to 10.87) 0.09 0.41
No 805 -3.57(-7.72 to 0.57) 2.52(-1.98 to 7.02) 0.83  
  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.