Table 2.

Characteristics of Mexican controls by European genetic ancestry, 2004 to 2007

European genetic ancestryP*
<2526-5051-7576-100
Age (y)51.9 (9)51.3 (9)50.9 (9)51.3 (10)0.954
BMI premenopausal women29.7 (5)30.3 (5)30.7 (6)30.8 (5)0.592
BMI postmenopausal women30.4 (5)31.3 (5)30.2 (5)34.7 (8)0.070
Age at menarche (y)12.9 (2)12.8 (2)12.9 (2)13.2 (2)0.332
No. of full-term pregnancies3.6 (2)3.9 (3)3.4 (2)4.1 (3)0.073
Ever breast-fed (%)90.789.785.0100.00.278
Family history of breast cancer (%)2.43.57.410.00.034
Benign breast disease (%)6.88.07.410.00.768
Postmenopausal HRT use (%)§14.712.721.116.70.266
Postmenopausal (%)54.756.553.360.00.891
Alcohol consumption (ever in past year/never; %)11.710.112.211.10.761
Socioeconomic status (%)<0.001
    Low42.328.025.00.0
    Middle31.536.929.733.3
    High26.234.945.366.7
Education (%)<0.001
    None11.87.34.40.0
    Some elementary school32.424.617.80.0
    Completed elementary school24.929.640.750.0
    High school graduate23.327.822.230.0
    College graduate5.15.88.90.0
    Postgraduate studies2.44.85.920.0
Caloric intake (kcal/d)1819.4 (584)1955.9 (682)2132.1 (761)2413.4 (1070)<0.001
  • *P values are for bivariate Fisher's exact tests in 2 × 2 tables (for categorical variables) and for ANOVA tests (for continuous variables).

  • Mean (SD).

  • Women who had at least one full-term pregnancy.

  • §Proportion of menopausal women that use hormone replacement therapy.