Table 2.

Clinical characteristics of patients at the time of diagnosis and of controls. Controls are matched with patients for age.

	Breast cancer n = 296	Controls n = 254	P
Age	47.4 ± 10.9	46.9 ± 12.7	0.65
Pre-menopausal	59.5%	55.9%	0.75
BMI	27.7 ± 5.0	27.1 ± 4.3	0.16
≥50 years old	39.5%	41.3%	0.84
Married	84.1%	91.7%	0.53
Never married ≥50 y	6.8%	5.7%	0.96
Nulligravida	13.9%	10.6%	0.38
Nulligravida ≥50 y	9.4%	2.8%	0.11
Children	5.0 ± 3.3	5.4 ± 3.5	0.16
Children, patients ≥50 y	6.1 ± 3.3	7.6 ± 3.3	0.001
History of mother or sister having breast cancer	11.1%	2.1%	< 0.001
History of mother or sister having breast cancer      Patients ≥50 y	14.1%	3.1%	0.02

Values for age, BMI, and number of children are mean ± standard deviation.