. Author manuscript; available in PMC: 2013 Sep 1.

Published in final edited form as: Dev Psychol. 2012 Mar 5;48(5):1488–1500. doi: 10.1037/a0027502

Table 4.

Hierarchical Regressions for Nucleus Accumbens Volumes Predicting Longitudinal Increases in BAS Drive and BAS Reward Responsiveness Scales

BAS Drive

Model	R²	F	P	Partial r	t	p
Step 1	0.26	12.36	<.001
Age				.16	1.92	ns
Sex				.03	.37	ns
Scanner upgrade				−.01	−.16	ns
BAS Drive T1				.44	5.74	<.001

Step 2	0.26	8.26	<.001
Left Nacc T1				−.04	−.41	ns
Right Nacc T1				−.04	−.50	ns

Step 3	0.30	7.23	<.001
Left Nacc T2				.13	1.53	ns
Right Nacc T2				.16	1.85	ns

BAS Reward Responsiveness
Step 1	0.14	5.68	<.001
Age				−.10	−.1.14	ns
Sex				.22	2.63	.009
Scanner upgrade				.10	1.09	ns
BAS RR T1				.27	3.26	.001

Step 2	0.18	5.11	<.001
Left Nacc T1				.06	.71	ns
Right Nacc T1				.19	2.24	.026

Step 3	0.18	3.80	<.001
Left Nacc T2				−.01	−.16	ns
Right Nacc T2				−.04	−.42	ns

Note: All Nacc volumes were corrected for total brain volume. Outcome variables are indices for BAS Drive and BAS Reward Responsiveness scales at Time 2. BAS RR = BAS Reward Responsiveness scale; T1 = Time 1; T2 = Time 2.