Table 1.

Birth years of male and female parents and numbers of progeny examined for whirling disease damage from each family group.

Family number	Male birth year	Female birth year	Midparental birth year	Number of progeny examined
1	1999	1995	1997	72
2	2003	2002	2002.5	17
3	2002	2002	2002	17
4	2001	2001	2001	35
5	2000	2001	2000.5	98
6	1996	1997	1996.5	25
7	1998	1998	1998	76
8	1997	1995	1996	57
9	2003	2002	2002.5	82
10	2002	2002	2002	74
11	1997	1994	1995.5	76