Table 2.

Correlations of insula/STG and dACC/SMA GMVs with clinical measures.

		Insula/STG GMV			dACC/SMA GMV
		Correlation		Slope test	Correlation		Slope test
		r	P	T value (p)	r	P	T value (p)
Years of smoking	Heavy	−0.22	0.078	1.26 (0.209)	−0.01	0.918	0.52 (0.606)
	Light	−0.02	0.818		−0.06	0.382
FTND score	Heavy	0.19	0.137	1.54 (0.124)	0.05	0.696	0.19 (0.852)
	Light	−0.02	0.740		0.06	0.383
Extn	Heavy	0.07	0.578	H vs. L: 0.15 (0.883)	0.36	0.003**	H vs. L: 1.94 (0.053)
	Light	0.10	0.161	L vs. N:0.17 (0.868)	0.04	0.622	L vs. N:0.37 (0.709)
	Never	0.07	0.306	N vs. H: 0.003 (0.998)	0.01	0.880	N vs. H: 2.30 (0.022*)
Intn	Heavy	0.13	0.307	H vs. L: 0.75 (0.455)	0.30	0.017*	H vs. L: 0.62 (0.533)
	Light	0.02	0.791	L vs. N: 0.21 (0.834)	0.09	0.220	L vs. N: 1.03 (0.302)
	Never	−0.01	0.844	N vs. H: 0.90 (0.369)	−0.01	0.866	N vs. H: 1.71 (0.089)

Note: dACC/SMA: dorsal anterior cingulate cortex/supplementary motor area; STG: superior temporal gyrus; GMV: gray matter volume; H: heavy smokers; L: light smokers; N: never smokers; Extn: Externalizing score; Intn: Internalizing score.

^**p < 0.005.

^*p < 0.05.