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Table 2 Linear regression β coefficients (95% confidence interval) for categories of total tea, green tea and black tea consumption predicting 5-year change in blood pressure in 1109 adults participating in the Jiangsu Nutrition Study

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

  <10 g/daya(7.1 g/day)b, β(95% CI) >10 g/daya(14.3 g/day), β(95% CI) P for trend
Total tea    
SBP    
Model 1 -1.10(-4.56 to 2.36) -2.41(-6.30 to 1.48) 0.20
Model 2 -0.29(-3.78 to 3.20) -2.03(-5.97 to 1.91) 0.35
Model 3 0.31(-3.45 to 3.51) -1.76(-5.70 to 2.19) 0.45
DBP    
Model 1 -1.92(-3.93 to 0.09) -2.79(-5.05to -0.53) <0.01
Model 2 -1.44(-3.47 to 0.60) -2.64(-4.94 to -0.34) 0.02
Model 3 -1.30(-3.33 to 0.73) -2.41(-4.71 to -0.11) 0.028
Green tea    
SBP    
Model 1 -1.17(-4.69 to 2.35) -3.96(-8.73 to 0.81) 0.10
Model 2 -0.45(-4.01 to 3.11) -3.28(-8.08 to 1.52) 0.23
Model 3 -0.14(-3.40 to 3.77) -2.71(-7.50 to 2.08) 0.35
DBP    
Model 1 -2.37(-4.41 to -0.33) -4.25(-7.02 to -1.49) <0.01
Model 2 -1.87(-3.94 to 0.21) -3.96(-6.76 to -1.16) <0.01
Model 3 -1.67(-3.74 to 0.40) -3.68(-6.47 to -0.89) <0.01
Black tea    
SBP    
Model 1 -2.99(-8.41 to 2.44) 2.41(-3.70 to 8.51) 0.85
Model 2 -2.34(-7.79 to 3.10) 1.82(-4.26 to 7.90) 0.89
Model 3 -2.46(-7.90 to 2.98) 1.40(-4.66 to 7.46) 0.99
DBP    
Model 1 -3.42(-6.56 to -0.27) 3.69(0.15 to 7.24) 0.43
Model 2 -2.82(-5.99 to 0.35) 3.18(-0.37 to 6.72) 0.46
Model 3 -2.71(-5.88 to 0.46) 2.99(-0.54 to 6.52) 0.49
  1. Values are β, 95% confidence interval (CI) from multilevel mixed-effects linear regression model adjusting for household clusters. Model 1 adjusted for age and sex. Model 2: model 1 + smoking (0, 1-19, ≥ 20 cigarettes/day), alcohol drinking (g/day), active commuting (no, 1-29 min/day, ≥30 min/day), leisure time physical activity (no, 1-29 min/day, ≥30 min/day), sleeping (<7 h/day, 7-8 h/day, ≥9 h/day), sedentary activity (<1 h/day,1-1.9 h/day, 2-2.9 h/day, ≥3 h/day), education (low, medium, high) and occupation (manual/non-manual), overweight (BMI > 24 kg/m2, yes/no), BMI change (continuous), central obesity (defined as waist circumference: men ≥ 90 cm, women ≥ 80 cm), eating out, passive smoking, family history of hypertension. Model 3: model 2 + energy and sodium, fibre, potassium intake, fruit, vegetable, high blood pressure medication (baseline, follow-up), salt and fat intake. CI, confidence interval. aReferent category is non-tea drinkers. bMedian tea consumption.