Table 3.

Group differences in the structural variables of the left thalamus and the pars triangularis^*

	Group; mean ± SD		Statistical tests†			Statistical tests‡
Variables	Control (n = 27)	Insomnia disorder (n = 22)	t	df	pFDR	F	df	pFDR
Pars triangularis
Volume, mm3	3107.10 ± 512.07	2802.36 ± 37.62	2.209	47	0.05	5.782	1,45	0.048
Adjusted volume§	0.00239 ± 0.00048	0.00202 ± 0.00031	3.236	45.001	0.014	14.322	1,45	0.003
Surface area, mm2	1322.78 ± 189.98	1189.45 ± 169.25	2.564	47	0.044	6.911	1,45	0.041
Grey matter thickness, mm	2.46 ± 0.15	2.46 ± 0.17	0.105	47	0.92	0.368	1,45	0.55
Grey matter volume, mm3	3725.22 ± 592.80	3349.82 ± 460.49	2.431	47	0.044	4.406	1,45	0.06
Thalamus
Volume, mm3	8699.79 ± 1129.52	8402.70 ± 1101.21	0.926	47	0.42	1.099	1,45	0.35
Adjusted volume§	0.00665 ± 0.00093	0.00605 ± 0.00061	2.158	45	0.05	4.62	1,43	0.058

FDR = false discovery rate; SD = standard deviation.

^*Structural measures 1.5 × interquartile range below Q1 (lower quartile) or above Q3 (upper quartile) were removed in all analyses.

^†Group differences in each diffusion measure using a Student’s t-test (for equal variance) or Welch’s t-test (for unequal variance).

^‡Adjusted for age and sex; analysis of covariance was performed to reveal group differences in structural variables.

^§Adjusted volume was defined as each region of interest volume divided by intracranial volume.