Table 6.

Best fit model for total, gray and white matter volumes for full sample (N=131) and sample with no SUD prior to MRI scan (N=107).

	Full sample (N=131)			Sample with no SUD (N=107)
	F value	d.f.	p value	F value	d.f.	p value
Total cerebellum
Linear model
Total sample	1.05	1, 129	NS	1.42	1, 106	NS
Females	<1.00	1, 64	NS	1.24	1, 54	NS
Males	<1.00	1, 63	NS	<1.00	1, 50	NS
Quadratic
Total sample	2.78	2, 128	0.07	3.86	2, 105	0.024
Females	<1.00	2, 63	NS	<1.00	2, 53	NS
Males	2.37	2, 62	0.10	3.51	2, 49	0.038
Gray matter
Linear model
Total sample	<1.00	1, 129	NS	<1.00	1, 106	NS
Females	1.02	1, 64	NS	<1.00	1, 54	NS
Males	<1.00	1, 63	NS	<1.00	1, 50	NS
Quadratic
Total sample	4.31	2, 128	0.015	5.77	2, 105	0.004
Females	1.41	2, 63	NS	1.11	2, 53	NS
Males	3.21	2, 62	0.047	6.33	2, 49	0.004
White matter
Linear model
Total sample	13.42	1, 129	<0.001	10.47	1, 106	0.002
Females	10.79	1, 64	0.002	9.62	1, 54	0.003
Males	2.38	1, 63	NS	<1.00	1, 50	NS
Quadratic
Total sample	6.85	2, 128	0.001	5.36	2, 105	0.006
Females	6.13	2, 63	0.004	5.45	2, 53	0.007
Males	1.23	2, 62	NS	<1.00	2, 49	NS