Table 1.

Descriptive statistics.

variables	BRCA1/2 mutation carriers			controls
	n	mean	s.d.	n	mean	s.d.
born before 1930
birth year	59	1906.78	17.72	885	1906.78	17.58
death year (if applicable)	52	1974.50	24.25	716	1981.90	21.51
year of first marriage	47	1929.70	18.36	850	1928.23	17.53
year of first birth	59	1930.22	18.67	885	1930.96	18.49
age at first marriage	47	21.77	3.34	850	21.40	3.53
age at first birth	59	23.44	3.31	885	24.18	4.80
age at last birth	59	36.76	5.15	885	33.94	6.27
first birth interval (years)	47	1.68	1.49	850	2.82	3.38
average birth interval (years)	59	2.69	1.10	877	3.64	2.62
number deceased children	59	0.39	0.87	885	0.35	0.78
children ever born	59	6.22	2.74	885	4.19	2.68
devout Mormon (dummy)	59	0.76	0.43	885	0.83	0.38
born 1930–1974
birth year	122	1949.10	9.43	1830	1949.10	9.39
death year (if applicable)	22	1997.41	6.67	102	2001.74	5.57
year of first marriage	63	1971.03	11.67	1670	1971.06	11.71
year of first birth	122	1972.19	10.10	1830	1973.52	11.59
age at first marriage	63	21.08	4.21	1670	22.00	4.45
age at first birth	122	23.09	3.51	1830	24.42	5.16
age at last birth	122	31.70	5.37	1830	31.72	5.45
first birth interval (years)	63	2.29	3.00	1670	2.50	2.87
average birth interval (years)	120	2.98	1.29	1824	3.17	2.15
number deceased children	122	0.03	0.22	1830	0.07	0.29
children ever born	122	4.13	1.82	1830	3.40	1.75