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Table 2 Participant characteristics by frequency of green tea intake

From: Green tea intake is associated with urinary estrogen profiles in Japanese-American women

 

Less than weekly intake (< once per week)

Weekly intake (1-6 times per week)

Daily intake (7+ times per week)

P value*

 

mean

s.d.

mean

s.d.

mean

s.d.

 

Age (y)*

45.4

6.8

48.3

8.2

49.7

7.0

0.01

Body Mass Index (kg / m 2 )

21.9

3.3

22.0

3.1

21.0

2.8

0.18

 

n

row %

n

row %

n

row %

 

Menopausal status / menstrual phase

      

0.049

Premenopausal women in luteal phase

62

52.1%

32

26.9%

25

21.0%

 

Postmenopausal

25

34.7%

23

31.9%

24

33.3%

 

Study center, n (%)

      

0.01

Hawaii

70

55.1%

34

26.8%

23

18.1%

 

Los Angeles

7

21.9%

13

40.6%

12

37.5%

 

San Francisco

10

31.3%

8

25.0%

14

43.8%

 

Combined parity and age at first birth, n (%)

      

0.07

Nulliparous

12

42.9%

8

28.6%

8

28.6%

 

1st birth age ≤ 20 y

7

63.6%

4

36.4%

0

.0%

 

1-2 live births / age ≥ 21

53

52.5%

23

22.8%

25

24.8%

 

3+ live births / age ≥ 21

15

29.4%

20

39.2%

16

31.4%

 

Age at menarche, n (%)

      

<0.001

≥ 12 y

56

54.9%

34

33.3%

12

11.8%

 

> 12 y

31

34.8%

21

23.6%

37

41.6%

 

Born in Asia, n (%)

      

<0.001

No

74

49.3%

49

32.7%

27

18.0%

 

Yes

13

31.7%

6

14.6%

22

53.7%

 

Soy intake (frequency of weekly intake), n (%)

      

<0.001

0-0.5 times weekly

31

66.0%

12

25.5%

4

8.5%

 

0.5-1 times weekly

27

47.4%

20

35.1%

10

17.5%

 

> once weekly

29

33.3%

23

26.4%

35

40.2%

 

Black tea (frequency of weekly intake), n (%)

      

0.21

< once weekly

69

50.7%

34

25.0%

33

24.3%

 

1-6 times weekly

12

32.4%

15

40.5%

10

27.0%

 

7+ times weekly

6

33.3%

6

33.3%

6

33.3%

 

Coffee (frequency of weekly intake), n (%)

      

0.75

0-2 times weekly

22

53.7%

11

26.8%

8

19.5%

 

3-13 times weekly

25

41.0%

18

29.5%

18

29.5%

 

≥14 times weekly

40

44.9%

26

29.2%

23

25.8%

 

Caffeine (weekly intake in mg), n (%)

      

0.83

0-734

29

50.0%

15

25.9%

14

24.1%

 

734-1609

27

47.4%

15

26.3%

15

26.3%

 

≥1610

31

40.8%

25

32.9%

20

26.3%

 
  1. * For continuous covariates, p-values were obtained using ANOVA and reflect significance of differences between means by categories of green tea intake. For categorical covariates, p-values were obtained using Chi Square tests and reflect differences in distribution.
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Nutrition Journal

ISSN: 1475-2891

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