Table 2. Df(h15q13)^−/− fraction of all animals at weaning and survival into adulthood depends on weaning conditions.

Condition	At weaning			Adulthood
	Total	−/−	−/− Fraction	Total	−/−	−/− Fraction	Binomial test
Weaning at 3 weeks	162	19	0.117	147	6	0.041	P<0.001
Weaning at 4 weeks	101	12	0.119	98	11	0.112	P>0.05
Weaning at 4 weeks+supplements	403	50	0.124	399	50	0.125	P>0.05

At weaning: genotyping at weaning, 3 or 4 weeks after birth. Df(h15q13)^−/− fraction compared with birth ratio by binomial test (birth ratio was 0.20). Adulthood: 8 weeks. Total: total number of mice. −/−: number of Df(h15q13)^−/− mice. −/− fraction: Df(h15q13)^−/− fraction of mice compared with fraction at weaning by binomial test. Supplements: nutritional supplements were added to the breeding cages. Pairwise testing probability of survival into adulthood assuming binomial numbers and using an approximate Gaussian test: weaning at 3 weeks vs weaning at 4 weeks P<0.05, weaning at 3 weeks vs weaning at 4 weeks+supplements P<0.01, weaning at 4 weeks vs weaning at 4 weeks+supplements P>0.05.