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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2018 Mar 6;27(5):585–593. doi: 10.1158/1055-9965.EPI-17-0595

Table 1.

Characteristics of the premenopausal study population (n=603) by body fatness at age 101

Recalled body fatness at 10 years old
1 2 3 4 5+
N 101 191 151 91 63
Caucasian, % 94 97 97 97 98
Age at urine collection,y 42.7(4.0) 42.7(4.0) 42.8(3.8) 42.7(3.5) 44.0(3.4)
BMI at urine collection, kg/m2 23.2 (3.8) 23.6(3.7) 25.1(4.9) 26.9(5.8) 30.3(6.9)
Height, m 1.66(0.06) 1.65(0.07) 1.65(0.07) 1.65(0.07) 1.67(0.07)
Parous, % 81 84 84 83 73
Age at first birth, y 26.8(4.2) 26.6(4.1) 26.2(4.8) 26.8(5.0) 28.1(5.7)
Physical activity, MET-hr/wk 22.0(23.3) 22.2(21.2) 20.4(16.8) 23.0(23.7) 19.9(17.1)
Alcohol intake, g/day 4.0(6.9) 4.0(6.5) 3.2(4.5) 4.3(5.8) 4.8(7.7)
Caffeine intake, mg/day 208(180) 217(194) 257(226) 241(174) 267(205)
Current smoker, % 4 4 9 5 8
Current menstrual cycle length of 26-31 days, % 59 65 75 66 65
Current menstrual cycles regular, % 96 96 95 96 95
Age at menarche 13.2(1.4) 12.8(1.3) 12.5(1.5) 11.9(1.3) 12.1(1.4)
Regular menstrual cycles within 1 year of menarche, % 36 46 46 51 60
Regular menstrual cycles during high school, % 80 90 91 88 95
Regular menstrual cycles during ages 18-22, % 83 91 92 93 94
Sample collected during ovulatory cycle, % 95 91 86 88 85
Sample collected 4-10 days before next period, % 88 84 84 90 83
First morning urine sample, % 78 80 85 75 79
Creatinine, mg/L 1021(504) 1217(608) 1158(564) 1076(586) 1093(691)
1

Participants recalled their body fatness at age 10 using a 9-level pictogram; from these reports we created ordinal variables for increasing body fatness as 1, 2, 3, 4, and 5+, with 5+ combining the five highest levels.

2

Values are means (SD) or percentages.

3

Numbers do not sum to 603 due to missing values for body fatness.