Table 1 Age and age-standardized characteristics at urine collection (1996–1999) of 1,343 women across quartiles of urinary aMT6s (ng/mg creatinine) in Nurses’ Health Study II ^a

N

335

336

336

336

Urinary aMT6s (ng/mg creatinine)^b,c

20.4 (9.2-27.6)

37.0 (30.6-43.0)

53.0 (46.3-61.3)

84.4 (67.6-124.2)

Age (years)^c

44.3 (4.5)

44.0 (4.2)

43.2 (4.4)

43.6 (4.1)

Birth weight, ≥ 7 lbs, %

64

62

59

63

Somatotype at age 5, ≥ diagram 5, %

7

7

8

5

Somatotype at age 10, ≥ diagram 5, %

11

10

10

10

Height (inches)

65.1 (2.6)

64.8 (2.5)

64.8 (2.6)

64.8 (2.4)

Body mass index at age 18 (kg/m²)

21.2 (2.9)

20.8 (2.5)

20.8 (2.9)

20.5 (2.3)

Current body mass index (kg/m²)

26.3 (6.0)

24.6 (4.7)

24.4 (4.5)

23.6 (4.0)

Weight change since age 18, ≥ 20 kg, %

26

17

17

11

Waist circumference (inches)

31.3 (5.0)

30.3 (4.2)

30.0 (4.5)

29.3 (3.6)

Waist to hip ratio

0.8 (0.1)

0.8 (0.1)

0.8 (0.1)

0.8 (0.1)

First morning urine sample, %

89

94

96

98

Full-term pregnancies, %

95

91

93

93

Physical activity (METs/week)^d

19.6 (25.0)

20.3 (22.8)

20.5 (23.5)

20.0 (29.6)

Alcohol intake (g/day)

3.7 (6.2)

3.7 (6.7)

3.2 (5.6)

3.9 (8.2)

Pack-years of cigarette smoking

13.6 (11.8)

10.3 (8.3)

12.1 (11.1)

11.9 (10.3)

Current smoker, %

8

6

3

6

Nulliparous, %

18

18

18

20

Post-menopausal, %

11

8

6

9

Current post-menopausal hormone use, %

8

7

5

8

Ever oral contraceptive use, %

86

86

84

85

Current antidepressant use, %

10

14

14

12

Ever night shift work in 2 weeks prior to urine collection, %

9

11

7

7

Ever night shift work in 2 years prior to urine collection, %

15

14

14

10

Ever night shift work prior to urine collection, %

67

66

72

62