Table 2. Summary of all data generated by behavioral observations and the pup retrieval test.

	Balb/c GR +/+	Balb/c GR +/−	C57Bl/6N GR +/+	C57Bl/6N GR +/−	Transf	Strain	Genotype	Interaction
In nest
licking/grooming [%]	7,951±1,070	9,790±1,454	16,615±1,273	11,101±2,476	NT	0,008 **		0,043 *
active nursing [%]	14,613±4,955	9,913±3,589	6,130±2,323	11,800±3,654	sqrt
passive nursing [%]	43,471±4,482	49,027±3,801	64,870±4,993	57,299±7,275	NT	0,013 *
nest building [%]	6,624±1,089	6,058±1,317	5,532±0,857	10,346±3,220	sqrt
self-grooming [%]	4,517±0,579	6,140±1,710	3,848±0,863	5,304±1,214	sqrt
pups out of nest [%]	5,507±2,484	2,070±1,485	1,498±1,265	0,246±0,123	sqrt	0,086 T
Out of nest
eating/drinking [%]	10,387±2,299	10,835±1,664	14,422±3,166	10,067±3,808	NT
self-grooming [%]	1,783±0,410	2,908±1,037	1,010±0,338	0,360±0,198	sqrt	0,002 **
climbing/digging [%]	6,924±1,514	5,578±1,186	1,718±1,254	2,477±1,123	NT	0,004 **
Pup retrieval test
handling [%]	26,410±4,661	24,658±5,226	34,614±8,825	47,402±6,456	NT	0,048 *
pups back in nest [s]	165,286±35,313	135,600±35,730	107,167±33,491	83,000±22,290	angular
crouching over pups [s]	232,714±33,622	166,600±39,829	178,500±41,680	206,143±44,680	angular			0,051 T

Data analysis was done using GLMs on the basis of 26 dams belonging to four different treatment groups: Balb/c wildtypes (+/+; n = 7), Balb/c with a heterozygous mutation of the GR (+/−; n = 6 for behavioral observations, n = 5 for the pup retrieval test) C57BL/6N wildtypes (+/+; n = 6), C57BL/6N with a heterozygous mutation of the GR (+/−; n = 7). Data are given as untransformed means ± standard error of the mean (s.e.m.). The statistical analysis is summarized with respect to the transformation used (NT = not transformed, sqrt = square root transformation, angular = angular transformation) and the effects of “strain”, “GR genotype” and “strain-by-GR-genotype-interaction” (T = tendency; *p<0.05, **p<0.01).