Table 2.

Subcortical structural volume analysis investigating the interaction between the study group and measures of sleep disturbance.

Dependent variable: volume of subcortical structure	Interaction term
	Study group × ESS			Study group × ISI
	β	Unadjusted value of p	FDR adjusted value of p	β	Unadjusted value of p	FDR adjusted value of p
Left thalamus	0.14	0.45	0.84	0.21	0.13	0.68
Left caudate	−0.26	0.19	0.68	0.02	0.91	0.91
Left putamen	0.21	0.35	0.75	0.55*	0.001	0.02
Left pallidum	0.05	0.79	0.91	0.06	0.69	0.89
Left hippocampus	−0.08	0.70	0.89	−0.39	0.009	0.09
Left amygdala	0.13	0.52	0.85	−0.19	0.22	0.68
Left accumbens	0.03	0.88	0.91	0.04	0.78	0.91
Right thalamus	0.09	0.66	0.89	0.16	0.30	0.71
Right caudate	−0.14	0.50	0.85	0.02	0.88	0.91
Right putamen	0.26	0.22	0.68	0.51*	0.001	0.02
Right pallidum	0.10	0.63	0.89	0.19	0.26	0.68
Right hippocampus	−0.31	0.15	0.68	−0.24	0.15	0.68
Right amygdala	0.22	0.27	0.68	−0.11	0.44	0.84
Right accumbens	−0.11	0.63	0.89	−0.04	0.83	0.91

Independent variables: Age, sex, estimated total intracranial volume, study group, sleep disturbance measure (i.e., ESS and ISI), study group × sleep disturbance measure (interaction term). Study groups are encoded as follows: Shift workers: 1; non-shift workers: 0. ^*FDR adjusted value of p < 0.05. ESS, Epworth Sleepiness Scale; ISI, Insomnia Severity Index; FDR, False Discovery Rate.