Table 2.

Characteristics of the GENESIS population according to the type of participant

Type of participant		Year of birth	Age at breast cancer diagnosis (years)	Age at inclusion (years)	Interval between diagnosis and inclusion
						By class
						≤4 years	5-9 years	≥10 years
	N	mean (SD) [min, max]	mean (SD) [min, max]	mean (SD) [min, max]	mean (SD)	N (%)	N (%)	N (%)
Index case	1682	1950 (9.3) [1918, 1977]	49.7 (9.3) [20, 80]	59.0 (9.3) [31, 90]	9.3 (7.4)	559 (33 %)	480 (29 %)	643 (38 %)
Affected sister	807	1949 (9.0) [1926, 1978]	51.4 (8.7) [27, 77]	59.5 (8.8) [30, 83]	8.1 (6.4)	297 (37 %)	249 (31 %)	258 (32 %)
Unaffected sister	592	1952 (9.3) [1926, 1978]		57.0 (9.2) [30, 84]
Control	1411	1953 (10.0) [1926, 1991]		55.7 (9.9) [19, 83]

N, number; SD, standard deviation; min, minimum; max, maximum; %, percentage