Table 2. Descriptive and test statistics for behavioural, morphological, and physiological data for each Strain (C57BL/6 or DBA/2), split by Cage Type (single strain or mixed strain).

Variable	Strain & Cage Type	Mean (95% CI)	Strain*Cage Typeinteraction statistics	p
Inactivity (% of scans)	C57BL/6 Mixed	20.2 (11.9–32.2)	F1,37 = 1.37	0.250
	C57BL/6 Single	15.3 (9.0–24.9)
	DBA/2 Mixed	3.5 (1.9–6.4)
	DBA/2 Single	5.0 (2.9–8.5)
Normal Activity (% of scans)	C57BL/6 Mixed	75.4 (67.9–81.6)	F1,39 = 0.15	0.703
	C57BL/6 Single	71.3 (64.5–77.3)
	DBA/2 Mixed	67.1 (58.5–74.6)
	DBA/2 Single	59.3 (52.0–66.2)
Stereotypy (% of scans)	C57BL/6 Mixed	3.1 (1.6–5.9)	F1,40 = 1.25	0.270
	C57BL/6 Single	7.6 (4.3–12.9)
	DBA/2 Mixed	25.3 (14.8–39.7)
	DBA/2 Single	30.4 (20.0–43.4)
Novel Object (s)	C57BL/6 Mixed	41.3 (24.9–68.6)	F1,42 = 0.0002	0.988
	C57BL/6 Single	44.0 (27.9–69.2)
	DBA/2 Mixed	14.7 (8.9–24.4)
	DBA/2 Single	15.5 (10.1–23.9)
Sucrose Consumption (g)	C57BL/6 Mixed	0.09 (0.06–0.13)	F1,40 = 0.054	0.809
	C57BL/6 Single	0.08 (0.05–0.11)
	DBA/2 Mixed	0.08 (0.05–0.11)
	DBA/2 Single	0.06 (0.04–0.08)
Startle Response (N)	C57BL/6 Mixed	0.12 (0.07–0.21)	F1,47 = 0.071	0.791
	C57BL/6 Single	0.11 (0.07–0.18)
	DBA/2 Mixed	0.05 (0.03–0.09)
	DBA/2 Single	0.04 (0.03–0.06)
Body Weight (g)	C57BL/6 Mixed	21.5 (20.6–22.3)	F1,42 = 0.82	0.370
	C57BL/6 Single	22.4 (21.7–23.1)
	DBA/2 Mixed	21.9 (21.0–22.7)
	DBA/2 Single	22.2 (21.5–22.8)
Spleen Weight (g)	C57BL/6 Mixed	0.082 (0.077–0.088)	F1,42 = 2.11	0.154
	C57BL/6 Single	0.080 (0.076–0.085)
	DBA/2 Mixed	0.081 (0.076–0.086)
	DBA/2 Single	0.085 (0.081–0.090)
Blood Glucose (mmol/L)	C57BL/6 Mixed	8.6 (7.4–9.7)	F1,37 = 0.092	0.763
	C57BL/6 Single	8.5 (7.4–9.7)
	DBA/2 Mixed	7.7 (6.5–8.8)
	DBA/2 Single	7.3 (6.2–8.4)
FCM * (ng/0.05 g of faeces)	C57BL/6 Mixed	48.6 (35.0–67.4)	F1,30 = 0.99	0.328
	C57BL/6 Single	59.3 (44.9–78.3)
	DBA/2 Mixed	89.2 (67.9–117.2)
	DBA/2 Single	82.6 (64.2–106.4)

^*Faecal Corticosterone Metabolites.