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Table 2 Characteristics of urine samples and participants in within-person reproducibility analyses

From: Within-person reproducibility of urinary bisphenol A and phthalate metabolites over a 1 to 3 year period among women in the Nurses’ Health Studies: a prospective cohort study

 

Bisphenol A study

Phthalate metabolite study

Phthalic acid study

Variable

Collection 1

Collection 2

Collection 1

Collection 2

Collection 1

Collection 2

Participants, N

80

80

40

40

34

33

Months between urine collections, %

 12

1

0

0

 13-18

18

5

6

 19-24

33

3

3

 25-30

23

34

41

 31-36

25

58

50

First morning urine, n (%)

68 (85)

66 (83)

39 (98)

34 (85)

33 (97)

29 (88)

Age, years, mean (range)

48 (33–78)

50 (34–81)

66 (54–78)

69 (56–81)

66 (54–78)

69 (56–81)

White race, n (%)

76 (95)

40 (100)

34 (100)

BMI, kg/m2, median (10th-90th percentile)

25 (21–35)

25 (21–38)

24 (20–30)

23 (20–31)

24 (20–30)

23 (20–30)

Current cigarette smoker, n (%)

2 (3)

1 (1)

2 (5)

1 (3)

1 (3)

1 (3)

  1. Abbreviation: BMI body mass index.