Skip to main content

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.