Table 1.

CB1 and testosterone: t-test results for comparisons of males with and without nest boxes

RA CB1 expression		mean	sd	CI −95	CI +95	t (df)	p	Effect size (Cohen's d)
no box (n = 10)		0.43	0.11	0.36	0.51	2.34 (17)	0.032	1.07
box (n = 9)		0.56	0.12	0.47	0.65
LS CB1 expression
no box (n = 10)		0.90	0.35	0.64	1.15	2.23 (18)	0.039	1.00
box (n = 10)		1.26	0.39	0.99	1.54
Area X CB1 expression
no box (n = 10)		1.08	0.45	0.76	1.4	0.01 (18)	0.990	0.01
box (n = 10)		1.08	0.31	0.85	1.3
VTA CB1 expression
no box (n = 9)		0.92	0.59	0.47	1.38	1.11 (15)	0.285	0.55
box (n = 8)		0.68	0.23	0.48	0.87
POM CB1 expression
no box (n = 10)		1.22	0.62	0.78	1.67	1.13 (18)	0.273	0.51
box (n = 10)		1.51	0.50	1.15	1.87
Testosterone (pg/ml)
no box (n = 10)		912.98	972.43	217.34	1608.62	1.21 (18)	0.242	0.54
box (n = 10)		1469.36	1082.66	694.87	2243.85