Table 1 Characteristics of cases and controls

From: Frequency of CHEK2 mutations in a population based, case–control study of breast cancer in young women

Characteristic	Cases (n = 506)		Controls (n = 459)
	n	%	n	%
Age at reference (years)
< 35	62	12.3	80	17.4
35+	444	87.7	379	82.6
Race
White	450	88.9	412	89.8
Nonwhite	56	11.1	47	10.2
Family history
None	280	56.7	294	66.1
First degree	94	19.0	36	8.1
Second degree	120	24.3	115	25.8
Unknown	12		14
Menopausal status
Premenopausal	445	88.3	392	85.8
Postmenopausal	59	11.7	65	14.2
Unknown	2		2

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