Table 3 . Postnatal day 28 weight of inbred and mixed background offspring.

	28-day females		28-day males
	Ts	Eu	Ts	Eu
B6.Ts1Rhr × B6	11.68	13.46	13.40	14.40
n	30	34	22	38
P-value (trisomic vs. euploid)	0.003		0.108
B6 × B6.Ts1Rhr	12.38	13.44	13.02	14.33
n	38	49	34	62
P-value	0.004		0.009
129B6.Ts1Rhr × B6C3F1	14.82	13.75	14.34	14.96
n	16	16	7	15
P-value	0.030		0.320
B6C3F1 × 129B6.Ts1Rhr	16.57	15.03	19.01	17.26
n	16	25	22	31
P-value	0.034		0.024