Table 4.

Zero-Inflated Poisson Regression Models of Marijuana Use Frequency Categories by Individual Subject Intercepts and Slopes from Multilevel Linear Models (MLM) of Orbital Frontal Cortex (OFC) Volume Residuals and OFC Thickness by Time-Varying CDI-C Anhedonia (N=137)

	Estimate	SE	t	p
Zero-inflated: marijuana abstinence
Intercept	−144.9453	2.6622	−54.45	<0.0001
Intercept from MLM of OFC volume residuals	−92.7248	174.4580	−0.53	0.5951
Caucasian race	358.0357	153.6707	2.33	0.0198
Male gender	−156.1959	422.8904	−0.37	0.7119
Age at last assessment	−17.2575	50.3923	−0.34	0.7320
Continuous: frequency of use
Intercept	−6.3711	2.2635	−2.81	0.0049
Intercept from MLM of OFC volume residuals	−0.1871	0.0982	−1.91	0.0568
Caucasian race	0.3343	0.3160	1.06	0.2901
Male gender	−0.1413	0.3121	−0.45	0.6507
Age at last assessment	0.3381	0.1394	2.43	0.0153
Zero-inflated: marijuana abstinence
Intercept	8631.4828	96.6595	89.30	<0.0001
Slope from MLM of OFC volume residuals	2021.8787	610.7295	3.31	0.0009
Caucasian race	984.1515	721.9290	1.36	0.1728
Male gender	941.9319	743.8689	1.27	0.2054
Age at last assessment	−677.0268	46.0206	−14.71	<0.0001
Continuous: frequency of use
Intercept	−5.5617	2.4598	−2.26	0.0238
Slope from MLM of OFC volume residuals	−0.8607	1.7057	−0.50	0.6138
Caucasian race	0.0247	0.2817	0.09	0.9301
Male gender	0.3570	0.2889	1.24	0.2166
Age at last assessment	0.2735	0.1519	1.80	0.0718
Zero-inflated: marijuana abstinence
Intercept	−977.6172	201.3198	−4.86	<0.0001
Intercept from MLM of OFC thickness	262.9481	581.2684	0.45	0.6510
Caucasian race	−385.6956	48.2515	−7.99	<0.0001
Male gender	−62.2419	364.4789	−0.17	0.8644
Age at last assessment	−119.4254	420.1010	−0.28	0.7762
Continuous: frequency of use
Intercept	2.1503	4.5573	0.47	0.6370
Intercept from MLM of OFC thickness	−0.6201	0.3927	−1.58	0.1143
Caucasian race	−0.3023	0.2952	−1.02	0.3058
Male gender	0.2429	0.2893	0.84	0.4011
Age at last assessment	0.2339	0.1513	1.55	0.1222
Zero-inflated: marijuana abstinence
Intercept	−1445.989	0.0404	−35772	<0.0001
Slope from MLM of OFC thickness	−12198	0.0069	0.00	<0.0001
Caucasian race	82.9762	0.0404	2052.86	<0.0001
Male gender	119.6468	0.0404	2960.08	<0.0001
Age at last assessment	−48.6716	0.6872	−70.83	<0.0001
Continuous: frequency of use
Intercept	−15.3208	3.5677	−4.29	<0.0001
Slope from MLM of OFC thickness	−54.2207	17.8396	−3.04	0.0024
Caucasian race	−0.0296	0.2821	−0.10	0.9165
Male gender	0.4101	0.2912	1.41	0.1590
Age at last assessment	0.3583	0.1444	2.48	0.0131