Table 2. [18F]-DOPA K_i^cer (min⁻¹) by Group.

ROI	Non-smoker controls (n=15)		Smokers (n=15)		Group comparisona
	Mean	SD	Mean	SD	tdf	p
STR	0.0130	0.0010	0.0128	0.0012	0.6428	0.53
AST	0.0126	0.0010	0.0122	0.0011	0.8428	0.41
LST	0.0132	0.0017	0.0135	0.0012	0.6328	0.53
SMST	0.0141	0.0011	0.0138	0.0016	0.6728	0.51

Abbreviations: AST, associative striatum; K_i^cer, influx rate constant; LST, limbic striatum; ROI, region of interest; SMST, sensorimotor striatum; STR, whole striatum.

^aIndependent-samples t-tests.