Table 2.

Effect of daylength and squared daylength on regional MOR availability in the human brain (uncorrected for multiple comparison)

Hem	Region	Daylength			Squared daylength			F(9, 194)	Adj.R2
		β	95% CI	t	β	95% CI	t
right	Amygdala	0.03	−0.005 to 0.07	1.71	−0.001	−0.002 to 0.0001	−1.82	6.66	0.20
right	Caudate	0.03	−0.01 to 0.07	1.37	−0.0009	−0.002 to 0.0004	−1.34	9.76	0.28
right	dACC	0.03	−0.001 to 0.07	1.92	−0.001	−0.002 to −0.00005*	−2.05	11.4	0.32
right	ITG	0.04	−0.003 to 0.08	1.84	−0.001	−0.002 to 0.0002	−1.74	12.00	0.33
right	Insula	0.04	0.001 to 0.07*	2.05	−0.001	−0.002 to −0.00002*	−2.00	3.19	0.09
right	MTG	0.05	0.01 to 0.09**	2.71	−0.002	−0.003 to −0.0004*	−2.56	12.40	0.34
right	Nacc	0.03	−0.008 to 0.06	1.52	−0.0009	−0.002 to 0.0002	−1.55	3.67	0.11
right	OFC	0.04	0.005 to 0.08*	2.24	−0.001	−0.002 to −0.0001*	−2.20	9.83	0.28
right	ParsO	0.05	0.02 to 0.09**	2.75	−0.002	−0.003 to −0.0005**	−2.83	11.30	0.31
right	PCC	0.04	0.04 to 0.08*	2.17	−0.001	−0.002 to −0.0001*	−2.15	12.60	0.34
right	Putamen	0.04	0.008 to 0.08*	2.44	−0.001	−0.003 to −0.0003*	−2.43	5.65	0.17
right	rACC	0.04	0.007 to 0.08*	2.34	−0.001	−0.003 to −0.0002*	−2.31	9.10	0.26
right	SFG	0.04	0.006 to 0.08*	2.25	−0.001	−0.003 to −0.0002*	−2.24	15.00	0.38
right	TP	0.05	0.01 to 0.1*	2.43	−0.002	−0.003 to −0.0003*	−2.39	5.35	0.16
right	Thalamus	0.03	0.00003 to 0.06*	1.97	−0.001	−0.002 to −0.00005*	−2.07	6.43	0.19
left	Amygdala	0.04	0.008 to 0.08*	2.43	−0.001	−0.003 to −0.0002*	−2.39	9.67	0.28
left	Caudate	0.03	−0.01 to 0.07	1.36	−0.0009	−0.002 to 0.0005	−1.27	8.96	0.26
left	dACC	0.03	−0.007 to 0.06	1.59	−0.001	−0.002 to 0.0002	−1.68	11.20	0.31
left	ITG	0.04	−0.002 to 0.07	1.87	−0.001	−0.002 to 0.0001	−1.77	13.40	0.31
left	Insula	0.03	−0.008 to 0.06	1.52	−0.0009	−0.002 to 0.0002	−1.55	5.21	0.16
left	MTG	0.03	−0.008 to 0.07	1.53	−0.0009	−0.002 to 0.0003	−1.42	15.40	0.16
left	Nacc	0.03	−0.01 to 0.06	1.34	−0.0008	−0.002 to 0.0004	−1.33	3.73	0.11
left	OFC	0.05	0.008 to 0.08*	2.42	−0.001	−0.003 to −0.0002*	−2.34	11.80	0.32
left	ParsO	0.03	−0.007 to 0.07	1.61	−0.001	−0.002 to 0.0002	−1.60	13.50	0.36
left	PCC	0.05	0.01 to 0.08**	2.65	−0.002	−0.003 to −0.0004**	−2.65	14.20	0.37
left	Putamen	0.03	−0.002 to 0.06	1.83	−0.001	−0.002 to 0.00008	−1.83	6.09	0.18
left	rACC	0.03	−0.003 to 0.07	1.81	−0.001	−0.002 to 0.0001	−1.81	9.51	0.27
left	SFG	0.04	0.002 to 0.08*	2.06	−0.001	−0.003 to −0.00005*	−2.06	15.90	0.40
left	TP	0.03	−0.01 to 0.07	1.45	−0.001	−0.002 to 0.0004	−1.45	5.29	0.16
left	Thalamus	0.03	−0.0004 to 0.06	1.95	−0.001	−0.002 to −0.00001*	−1.99	5.18	0.16

In the single ROI data analysis, linear regression model was used with factors including daylength, squared daylength, age, sex, BMI, and scanner type. The t values (t) of each factor, F values, and adjusted R² of the full models are also listed. dACC, Dorsal anterior cingulate cortex; rACC, rostral anterior cingulate cortex; Nacc, nucleus accumbens; ITG, inferior temporal gyrus; MTG, middle temporal gyrus; OFC, orbitofrontal cortex; PCC, posterior cingulate cortex; ParsO, pars opercularis; SFG, superior frontal gyrus; TP, temporal pole.

*p < 0.05,

**p < 0.01.