Table 1.

Saline group strain means (± SEM) for activity (counts/min) during habituation, conditioning and testing and for time spent on the grid floor (s/min) during testing.

Strain	n	Habituation	Saline: Trial 1*	Saline: Trial 4*	Preference Test	Test Activity
		(activity/min)	(activity/min)	(activity/min)	(s/min)	(activity/min)
129P3/J	13#	63.1±5.7	47.7±2.5b	37.6±3.2b	40.7±2.7	35.2±2.4
A/HeJ	12	50.6±5.8	46.8±3.2	30.2±3.4b	30.6±2.8	36.8±3.6
AKR/J	12	80.0±5.3	57.7±6.4	37.4±3.0d	30.2±1.9	44.6±1.5
BALB/cJ	12	83.1±4.9	66.6±3.6c	71.2±4.7	33.3±2.2	60.0±6.8
C3H/HeJ	13	29.8±3.6	33.7±1.6	25.0±2.0	35.5±0.9	29.8±0.7
C57BL/6J	12	123.7±11.0	77.6±7.3c	36.9±1.8d	32.9±2.0	51.2±4.6
C57L/J	13	117.7±4.2	84.5±4.7d	57.8±3.8d	36.1±2.1	55.6±3.6
C58/J	12	112.7±7.3	88.0±5.5a	59.2±7.4d	30.5±1.5	80.9±7.6
CBA/J	12	58.1±5.4	52.6±2.2	37.2±2.4b	33.7±1.9	34.8±1.0
DBA/1J	13	61.5±5.3	64.1±3.9	33.5±2.8b	32.4±2.7	38.5±2.9
DBA/2J	13	55.4±4.4	56.7±3.2	44.4±3.6	28.5±1.6	42.0±1.9
NZB/B1NJ	12	46.7±3.6	34.8±2.3a	25.7±4.6b	26.6±2.9	23.7±2.3
PL/J	12	59.3±1.9	56.9±1.9	44.8±2.4c	32.7±1.0	32.3±2.0
SJL/J	12	57.2±4.6	37.4±3.2c	25.3±2.4d	33.0±2.4	25.1±2.7
SWR/J	12	80.3±5.0	42.9±2.8d	34.4±1.6d	35.7±2.3	33.7±1.7
Grand Mean		71.8±2.4	56.6±1.6	40.1±1.3	32.9±0.6	41.6±1.4
Heritability		0.67	0.61	0.54	0.18	0.60

^*These scores are the mean activity rates on the first two saline trials (“Trial 1”) or the last two saline trials (“Trial 4”).

^#except for Habituation where n = 12

d= p<0.0001, c= p<0.001, b= p<0.01, a= p<0.05, significant change from habituation session