Table 1.

Characteristics of the study population by case and control status

CharacteristicCases (n = 246)
Controls (n = 522)
nMean (SD) or percent distributionnMean (SD) or percent distribution
Age at mammogram (y)24663.9 (10.1)52264.1 (10.2)
Interval between mammogram and breast cancer diagnosis (cases) or exam date (controls), y2463.8 (1.0)5223.7 (1.0)
PD24528.9 (13.1)52025.1 (13.9)
BMI (kg/m2)23527.9 (5.0)51027.6 (5.3)
Menopausal status
    Premenopausal219%408%
    Postmenopausal22091%47292%