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Table 1 Descriptive characteristics of the study population (n = 743), by quartile of adolescent total fiber intake

From: Adolescent fiber intake and mammographic breast density in premenopausal women

Characteristic Adolescent total fiber intake quartile
1st 2nd 3rd 4th
(≤17.32 g/day, median 15.7) n = 183 (17.33–20.40 g/day, median 18.9) n = 184 (20.41–23.37 g/day, median 21.6) n = 190 (>23.37 g/day, median 26.5) n = 186
Mean (STD)     
 Age at mammogram, years 45.2 (4.2) 44.9 (4.0) 45.0 (4.1) 44.6 (4.0)
 BMI at mammogram 25.9 (6.0) 25.2 (5.6) 25.2 (4.7) 25.6 (6.5)
 BMI at age 18 21.1 (3.0) 20.9 (2.7) 20.9 (2.8) 21.3 (3.3)
 Percent density 40.8 (18.3) 41.5 (17.5) 41.2 (18.6) 41.2 (18.0)
 Absolute dense area, cm2 90.9 (48.0) 94.3 (50.0) 96.3 (52.0) 94.4 (50.3)
 Non-dense area, cm2 144.7 (78.4) 141.9 (76.8) 147.5 (78.2) 146.2 (79.2)
 Age at menarche, years 12.4 (1.4) 12.3 (1.4) 12.4 (1.5) 12.4 (1.6)
 Caloric intake, adolescence 2730 (848) 2672(702) 2857 (773) 2800 (768)
 Caloric intake, adulta 1732 (453) 1820 (445) 1858 (467) 1894 (531)
 Alcohol consumption, g/day 4.1 (6.0) 4.6 (8.7) 4.8 (8.5) 4.6 (7.3)
 Adult total fiber intake, median (range)b 17.1 (8.1–35.3) 18.0 (5.9–39.5) 19.2 (8.4–48.4) 21.6 (12.3–43.6)
Number (%)     
 Parity/age at first child’s birth     
  Nulliparous 31 (16.9) 34 (18.5) 34 (17.9) 47 (25.3)
  1–4 children, <25 years 57 (31.2) 54 (29.4) 50 (26.3) 42 (22.6)
  1–4 children, 25–29 years 60 (32.8) 66 (35.9) 64 (33.7) 63 (33.9)
  1–4 children, ≥30 years 34 (18.6) 28 (15.2) 40 (21.1) 32 (17.2)
  ≥5 children, <25 years 1 (0.6) 1 (0.5) 2 (1.1) 2 (1.1)
  ≥5 children, ≥25 years 0 1 (0.5) 0 0
 History of biopsy-confirmed benign breast disease 34 (18.6) 37 (20.1) 33 (17.4) 32 (17.2)
 Family history of breast cancer 13 (7.1) 16 (8.7) 17 (9.0) 19 (10.2)
  1. Abbreviations: BMI body mass index, STD standard deviation
  2. aDifference across adolescent total fiber intake quartiles statistically significant at 0.01 level (analysis of variance for continuous variables or chi-square test for categorical variables)
  3. bDifference across adolescent total fiber intake quartiles statistically significant at 0.001 level (analysis of variance for continuous variables or chi-square test for categorical variables)