Table 3.

Mann-Whitney U test for adjusted behavioral stress scores across all groups.

			Mann-Whitney U
Group Comparison		Median	Interquartile Range	P value
Red-Tinted (R) compared with Traditional (T) Chamber	Male C57BL/6J	R: 2.0	R: 1.75	0.0171*
		T: 0.0	T: 1.0
	Female C57BL/6J	R: 2.5	R: 1.0	0.2535
		T: 2.0	T: 2.0
	Male BALB/cJ	R: 3.0	R: 1.0	<0.0001*
		T: 0.0	T: 0.0
	Female BALB/cJ	R: 2.0	R: 2.0	<0.0001*
		T: 0.0	T: 0.0
C57BL/6J compared with BALB/cJ: Males	Red-Tinted			0.1339
	Traditional			0.4786
C57BL/6J compared with BALB/cJ: Females	Red-Tinted			0.3265
	Traditional			0.0001*
C57BL/6J (M compared with F)	Red-Tinted			0.1714
	Traditional			0.0126*
BALB/cJ (M compared with F)	Red-Tinted			0.2295
	Traditional			0.4783
Normality was assessed using the Shapiro-Wilk test then followed by multiple Mann-Whitney U tests. Adjusted behavioral stress score used to assess chamber effect across all groups. Differences were only considered significant at P values less than 0.05 (one * per significant result).