Early Social Enrichment Improves Social Motivation and Skills in a Monogenic Mouse Model of Autism, the Oprm1^−/− Mouse

Table 1

Mean (±SEM) body weight (gr.) of mice (males and females) belonging to the four experimental groups.

Experimental groups	Oprm1		Oprm1		ANOVA
	L	L+L	L	L+L	G	RC	S
Day 8
Males	4.68 ± 0.15	5.99 ± 0.23	4.60 ± 0.24	6.49 ± 0.10	0.78	152.02	0.14
Females	4.68 ± 0.20	6.31 ± 0.17	4.65 ± 0.17	6.40 ± 0.16
					ANOVA
					G	E	S
Days 28–30
Males	16.32 ± 0.48	14.08 ± 0.51	14.86 ± 0.79	15.03 ± 0.89	1.69	1.41	0.21
Females	15.64 ± 0.44	15.06 ± 0.56	14.17 ± 0.29	14.54 ± 0.66
					ANOVA
					G	E	S
Days 75–80
Males	27.17 ± 0.59	28.06 ± 0.41	25.75 ± 0.87	26.68 ± 0.54	0.68	0.53	90.42
Females	21.36 ± 0.31	21.75 ± 0.30	22.39 ± 0.82	21.74 ± 0.53

G: genotype; RC: rearing condition; S: sex. , .
Sample sizes are reported in brackets.