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Table 1 Clinical and demographic profile of case and control groups

From: Evaluation of volumetric breast density as a risk factor for breast carcinoma in pre- and postmenopausal women, its association with hormone receptor status and breast carcinoma subtypes defined by histology and tumor markers

Variables Cases (n = 185) Controls (n = 244)
Menopausal status-   
 Premenopausal 79 109
 postmenopausal 106 135
Age (mean + SD) 50.3 + 11.02 years 48.7 + 10.1 years
Age at menarche (mean + SD) 13.4 + 0.76 years 13.4 + 0.92 years
Age at first childbirth (mean + SD) 20.7 + 5.97 years 20.9 + 6.7 years
Parity   
 Nulliparous 11 16
 Parous 174 228
Exclusive breast feeding   
 Present 148 196
 Absent 37 48