Table 1

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

CharacteristicPremenopausal (n = 105)Postmenopausal (n = 191)
n(%a)n(%a)
Age group (yrs.)
 40–4568(65)7(4)
 46–5029(28)28(15)
 51–558(8)49(26)
 56–600(0)49(26)
 ≥610(0)58(30)
Education
 <High school62(59)130(68)
 High school36(34)49(26)
 >High school7(7)12(6)
Body mass index (kg/m2)
 18.6–27.216(15)42(22)
 27.3–29.829(28)31(16)
 29.9–32.121(20)39(20)
 32.2–35.418(17)41(21)
 35.5–51.221(20)38(20)
Number of births
 04(4)6(3)
 1–233(31)33(17)
 3–443(41)69(36)
 ≥525(24)83(43)
Age at first birth for parous women (yrs.)
 ≤1836(36)62(34)
 19–2123(23)61(33)
 22–2416(16)25(14)
 ≥2525(25)37(20)
Age at menarche (yrs)b
 ≤1118(17)31(16)
 1218(17)30(16)
 1329(28)46(24)
 1420(19)42(22)
 ≥1519(18)42(22)
Age at menopause (yrs)c
 22–4241(22)
 43–4638(20)
 47–5055(29)
 51–5953(28)
Use of hormone replacement therapy
 Never95(90)114(60)
 Past5(5)27(14)
 Current5(5)50(26)
Cigarette smoking
 Never81(77)148(77)
 Past13(12)33(17)
 Current11(10)10(5)
Alcohol intake
 Non-drinker81(77)165(86)
 <1 drink/week18(17)19(10)
 ≥1 drink/week6(6)7(4)
First degree family history of breast cancer
 No96(91)170(89)
 Yes2(2)13(7)
 Don’t know7(7)8(4)
  • a For some characteristics, the percentage of women may not add to 100% because of rounding.

  • b Excludes 1 premenopausal woman missing data on age at menarche.

  • c Excludes 4 postmenopausal women missing data on age at menarche.