Contribution of BRCA1 and BRCA2 Germline Mutations to Early Algerian Breast Cancer

Table 1

Clinical characteristics of study population: age at diagnosis, at menarche, at first pregnancy, and at first use of oral contraceptive.

Mean age (years)	BRCA mutation carriers			Noncarriers
	BRCA1	BRCA	BRCA2
At diagnosis	37.75	34.63	31.50	37.06
At menarche	15.00; ≤12: 00%; 13-14: 25%; 15-16: 75%	13.63; ≤12: 14.2%; 13-14: 21.3%; 15-16: 21.4%	12.25; ≤12: 50%; 13-14: 50%; 15-16: 00%	14.13; ≤12: 15.7%; 13-14: 40.6%; 15-16: 40.7%; >16: 03.1%
At first pregnancy	22.25	24.00	26.33	26.50
At first use of oral contraceptive	26.00	26.29	26.66	26.15