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Table 1 Sample characteristic (in 2002) according to tea consumption (in 2007) among Chinese adults a (N= 1109)

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

  Total tea Green tea Black tea
  0 g/day (N= 846) <10 g/day (7.1 g/dayb, N= 148) >10 g/day (14.3 g/day, N= 115) P 0 g/day (N= 900) <10 g/day (7.1 g/day, N= 139) >10 g/day (14.3 g/day, N= 70) P 0 g/day (N= 1018) <10 g/day (7.1 g/day, N= 51) >10 g/day (14.3 g/day, N= 40) P
Age 48.9 50.2 50.0 0.37 48.9 50.8 49.7 0.11 49.1 50.4 49.8 0.74
(years) (0.5) (1.1) (1.1)   (0.4) (1.1) (1.4)   (0.4) (1.8) (2.1)  
Men (%) 32.86 69.59 79.13 <0.01 35.2 71.2 80.0 <0.01 39.8 68.6 80.0 <0.01
Urban (%) 11.8 13.5 17.4 0.23 11.3 18.7 17.1 0.03 12.77 15.69 5.00 0.28
Low education (%) 55.2 50.7 43.5 0.01 55.0 48.9 41.4 <0.01 53.9 49.0 45.0 0.16
Manual job (%) 55.6 45.9 40.0 <0.01 54.8 43.2 44.3 0.01 53.6 47.1 35.0 0.05
No active commuting (%) 39.5 43.9 45.2 0.06 40.2 43.9 40.0 0.06 40.1 43.1 52.5 0.58
No leisure time physical activity (%) 92.8 87.8 85.2 0.03 92.7 85.6 85.7 0.03 91.9 84.3 87.5 0.03
Sleeping < 7 h/day 11.8 12.4 15.9 <0.01 12.2 11.8 14.7 0.02 12.0 13.7 17.5 0.09
Sedentary activity < 1 h/day 18.8 6.8 5.2 <0.01 18.2 6.5 2.9 <0.01 16.5 3.9 12.5 <0.01
Smoker (%) 19.9 51.4 58.3 <0.01 22.1 48.9 62.9 <0.01 25.7 51.0 57.5 <0.01
Alcohol drinker (%) 20.9 40.8 40.9 <0.01 22.7 36.2 42.9 <0.01 24.4 37.3 42.5 <0.01
Weight 59.6 60.6 60.7 0.37 59.5 61.4 61.5 (1.2) 0.04 59.97 58.53 58.48 0.38
(kg)c (0.3) (0.9) (0.9)   (0.3) (0.8)    (0.3) (1.3) (1.5)  
Waist circumference 78.5 79.5 79.8 0.26 78.4 80.3 80.3 0.05 78.86 77.59 78.24 0.60
(cm)c (0.3) (0.8) (0.9)   (0.3) (0.8) (1.1)   (0.3) (1.3) (1.5)  
Central obesity (%)e 31.7 27.7 22.6 0.10 30.6 30.2 25.7 0.69 31.5 17.7 15.0 0.01
Obesity (%) (BMI ≥ 28 kg/m2) 10.3 8.1 7.8 0.43 10.0 7.9 10.0 0.21 10.3 2.0 5.0 0.21
BMI 23.3 23.7 23.8 0.30 23.3 24.0 24.0 0.04 23.4 22.8 23.4 0.36
(kg/m2)c (0.1) (0.3) (0.3)   (0.1) (0.3) (0.4)   (0.1) (0.5) (0.5)  
Hypertension (%) 29.7 37.8 33.9 0.11 29.7 37.4 38.6 0.07 31.3 37.3 20.0 0.20
SBP 126.7 126.5 126.2 0.97 126.5 127.0 127.2 0.93 126.8 125.6 122.0 0.28
(mmHg)c (0.7) (1.6) (1.8)   (0.6) (1.6) (2.3)   (0.6) (2.7) (3.0)  
DBP 79.6 80.3 81.0 0.47 79.5 80.9 82.5 0.06 80.0 81.2 75.6 0.04
(mmHg)c (0.4) (0.9) (1.1)   (0.4) (1.0) (1.4)   (0.4) (1.6) (1.8)  
Energy 2376.5 2260.8 2288.2 0.07 2363.5 2286.3 2333.5 0.40 2361.6 2222.9 2272.3 0.21
(Kcal/day)c (21.4) (51.6) (58.8)   (20.6) (53.3) (74.6)   (19.2) (86.2) (97.7)  
Fat 80.1 87.5 87.4 <0.01 80.8 86.5 86.2 0.02 81.0 95.1 84.6 <0.01
(g/day)d (0.9) (2.1) (2.4)   (0.8) (2.2) (3.1)   (0.8) (3.5) (4.0)  
Protein 72.0 72.4 76.9 <0.01 72.1 74.0 75.6 0.09 72.3 71.8 79.9 <0.01
(g/day)d (0.5) (1.2) (1.4)   (0.5) (1.2) (1.7)   (0.4) (2.0) (2.3)  
Carbohydrate 324.6 307.2 306.0 <0.01 321.8 314.8 312.3 0.27 322.9 (1.9) 283.4 302.4 <0.01
(g/day)d (2.1) (5.2) (5.9)   (2.1) (5.4) (7.5)    (8.6) (9.7)  
Fibre 12.6 9.6 9.5 <0.01 12.5 9.8 8.7 (1.1) <0.01 12.0 10.5 10.5 0.30
(g/day)d (0.3) (0.7) (0.8)   (0.3) (0.8)    (0.3) (1.3) (1.4)  
Sodium 6.7 6.9 6.8 0.89 6.8 6.7 6.8 0.99 6.7 7.3 6.8 0.66
(g/day)d (0.1) (0.4) (0.4)   (0.1) (0.4) (0.5)   (0.1) (0.6) (0.7)  
  1. aMean(SE), nutrients and alcohol intake were calculated from weighted food records, other food intakes were calculated from food frequency questionnaire.
  2. bMedian tea consumption. cAdjusted for age and sex. dAdjusted for age and sex and energy intake. eBased on IDF definition for Chinese population.