TABLE 2B.

Multiple linear regression models of predictors of urine total NNAL, urine total PAH metabolites, and urine nicotine equivalents per cigarette smoked

Dependent Variable	Modela	Parameter	Estimate	95% CI	p Value
Log NNAL/CPD (pmol/mg creat)	1	Race (White)	−0.347	−0.619, −0.074	0.013
	R2 = 0.13	FTND for Blacks	−0.060	−0.098, −0.023	0.002
		FTND for Whites	0.005	−0.026, 0.035	0.759
		White x FTND interaction	0.065	0.018, 0.113	0.008
	2	Race (White)	0.083	−0.047, 0.212	0.209
	R2 = 0.28	TFC for Blacks	−0.0006	−0.004, 0.002	0.692
		TFC for Whites	−0.002	−0.003, −0.001	0.002
		White x TFC interaction	−0.001	−0.004, 0.002	0.399
Log PAH/CPD (pmol/mg creat)	1	Race (White)	−0.109	−0.304, 0.085	0.270
	R2 = 0.25	FTND for Blacks	−0.051	−0.078, −0.024	<0.001
		FTND for Whites	−0.016	−0.037, 0.006	0.156
		White x FTND interaction	0.035	0.002, 0.069	0.039
	2	Race (White)	0.124	0.035, 0.213	0.007
	R2 = 0.43	TFC for Blacks	−0.001	−0.003, 0.0009	0.298
		TFC for Whites	−0.001	−0.002, −0.0003	0.009
		White x TFC interaction	0.000	−0.002, 0.002	0.990
Log Neq/CPD (nmol/mg creat)	1	Race (White)	−0.343	−0.553, −0.134	0.001
	R2 = 0.15	FTND for Blacks	−0.056	−0.085, −0.026	<0.001
		FTND for Whites	−0.003	−0.026, 0.020	0.802
		White x FTND interaction	0.053	0.016, 0.090	0.005
	2	Race (White)	−0.003	−0.093, 0.086	0.939
	R2 = 0.42	TFC for Blacks	−0.001	−0.003, 0.001	0.170
		TFC for Whites	−0.001	−0.002, −0.0007	<0.001
		White x TFC interaction	0.000	−0.002, 0.002	0.959

NOTE: FTND = Fagerström Test for Nicotine Dependence; TFC = time to first cigarette (min); NNAL = 4-(methylnitrosamino)-1-(3)pyridyl-1-butanol; PAH = polycyclic aromatic hydrocarbon metabolites; NEq = nicotine equivalent;

^aModels were adjusted for sex, age, body mass index, years of education and employment status.