Table 1.

Genotypes of CHF1 knockout mice at birth and 3 wk

Background	Age	(+/+)	(+/−)	(−/−)	Total	χ2
Mixed	Birth	46	111	39	196	P = NS
Mixed	3 wk	57	117	22	196	P < 0.001
129/SvJ	Birth	54	117	46	217	P = NS
129/SvJ	3 wk	83	174	5	262	P < 0.001

NS, not significant.