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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.