Table 2

Univariate associations of sociodemographic, reproductive, health, and lifestyle characteristics with mean (SD) percentage of breast density among Hispanic women

CharacteristicPremenopausal (n = 105)Postmenopausal (n = 191)All (n = 296)
Mean percentage of density(SD)PMean percentage of density(SD)PMean percentage of density(SD)P
Age group (yrs.)
 40–4522.7(10.9)14.3(8.4)21.9(10.9)
 46–5021.6(12.1)18.1(10.7)19.9(11.5)
 51–5520.8(9.7)0.8517.2(10.1)17.7(10.0)
 56–60--13.5(8.1)13.5(8.1)
 ≥61--13.3(8.1)0.0513.3(8.1)<0.0001
Education
 <High school23.2(11.5)15.0(8.9)17.6(10.6)
 High school20.7(10.5)15.2(8.6)17.5(9.8)
 >High school21.5(9.6)0.5616.2(14.3)0.9018.2(12.7)0.97
Body mass index (kg/m2)
 18.6–27.229.8(12.9)18.4(10.0)21.5(11.9)
 27.3–29.824.4(12.3)14.7(9.4)19.4(11.9)
 29.8–32.119.7(9.5)13.8(8.7)15.9(9.4)
 32.2–35.422.9(7.1)14.3(9.2)16.9(9.4)
 35.5–51.215.4(7.4)0.000814.0(8.3)0.1414.5(8.0)0.002
Number of births
 025.4(6.7)18.0(15.9)21.0(13.1)
 1–220.9(12.6)15.2(9.9)18.0(11.6)
 3–424.6(10.8)15.3(9.1)18.9(10.7)
 ≥519.6(9.2)0.2414.7(8.6)0.8415.8(8.9)0.11
Age at first birth among parous women (yrs.)
 ≤1822.0(11.2)14.1(7.7)17.0(9.9)
 19–2123.5(10.3)15.8(9.1)17.9(10.0)
 22–2423.9(12.1)16.4(12.3)19.3(12.6)
 ≥2520.4(11.4)0.7214.4(8.2)0.6016.8(10.0)0.60
Age at menarche (yrs.)a
 ≤1122.9(12.5)17.2(10.3)19.3(11.4)
 1225.4(11.2)14.3(9.5)18.5(11.4)
 1318.8(8.8)15.8(9.3)17.0(9.2)
 1423.5(10.6)14.3(9.0)17.3(10.4)
 ≥1522.6(13.0)0.3314.2(8.4)0.5916.8(10.7)0.69
Age at menopause (yrs.)b
 22–42---15.3(9.3)---
 43–46---15.5(8.7)---
 47–50---14.2(8.6)---
 51–59---15.2(9.9)0.88---
Menopausal status
 Premenopausal------22.2(11.0)
 Postmenopausal------15.1(9.2)< 0.0001
Use of hormone replacement therapy
 Never21.9(10.5)14.0(8.5)17.6(10.2)
 Past22.1(17.6)14.0(8.5)15.2(10.5)
 Current29.2(13.7)0.3518.2(10.5)0.0219.2(11.1)0.22
Cigarette smoking
 Never21.6(10.4)14.9(9.1)17.3(10.1)
 Past20.8(14.2)15.0(10.0)16.6(11.4)
 Current28.9(10.0)0.1017.7(9.7)0.6623.6(11.2)0.02
Alcohol intake
 Nondrinker21.9(11.4)15.1(9.1)17.4(10.4)
 <1 drink/week21.9(9.0)13.9(6.9)17.8(8.9)
 ≥1 drink/week27.4(12.4)0.5017.7(16.5)0.6522.2(15.0)0.27
First=degree family history of breast cancerc
 No21.8(11.3)15.1(9.4)17.5(10.6)
 Yes29.0(3.4)0.3714.5(7.5)0.8316.4(8.7)0.70
  • a Excludes 1 premenopausal woman with missing data on age at menarche.

  • b Excludes 4 postmenopausal women who were missing data on age at menopause.

  • c Excludes 7 premenopausal and 8 postmenopausal women who did not know their family history of breast cancer.