Table 2.

Results of statistical tests performed on dishabituation scores [using number of sniff bouts (SB) and sniff bout duration (SD)]

Experiment	Measured behavioral response	Control trials	Test trials	Control vs. test trials
Pure-bred B6 vs. bm1	SB	T = 1.8, P = 0.042*	T = 4.6, P = 0.0001**	T = 1.8, P = 0.042*
(n = 19)	SD	T = 1.3, P = 0.11	W = 70.5, P = 0.001**	W = 45, P = 0.036*
F2:B6 vs. bm1	SB	T = −0.98, P = 0.83	T = 0.5, P = 0.30	T = 0.98, P = 0.17
(n = 20)	SD	W = 12.5, P = 0.38	T = 0.83, P = 0.20	T = −0.07, P = 0.53
F2:B6 vs. bm3	SB	T = −1.05, P = 0.84	T = −0.29, P = 0.61	T = 0.52, P = 0.30
(n = 28)	SD	T = −0.63, P = 0.73	W = 15.5, P = 0.36	W = 39.5, P = 0.19
F2:bm1 vs. bm3	SB	T = −1.02, P = 0.84	T = 1.81, P = 0.043*	T = 1.9, P = 0.039*
(n = 28)	SD	W = −4, P = 0.55	W = 71.5, P = 0.001**	T = 1.5, P = 0.070

The Control trials column shows whether sniffers could discriminate between the odor of different individuals with the same MHC. The Test trials column shows whether mice could discriminate between the odor of individuals with different MHC. The final column indicates whether dishabituation scores for test trials were significantly greater than control trials. Paired, one-way Student's t tests (T) or Wilcoxon tests (W) were performed. 

^*, P < 0.05 significance level; 

^**, P < 0.001 significance level; 

^**, P < 0.0001 significance level.