Table 3.

Regression of Smoking Status on Serum BDNF^a

Predictors	B	SE	β	p
Age	0.03	0.01	.11	.01**
Sex	0.09	0.27	.01	.74
Education	0.01	0.04	.01	.85
Past-year negative life events	−0.13	0.11	−.04	.25
Alcohol use	0.004	0.03	.01	.88
BMI	0.01	0.03	.02	.59
Antidepressant use	0.06	0.13	.02	.62
Diagnostic status of an affective disorder	0.04	0.26	.01	.87
Number of cigarettes smoked per day	−0.01	0.02	−.02	.68
Total smoking years	0.02	0.01	.10	.05*
Nicotine dependence	−0.13	0.12	−.05	.26

^aData have been shown only for the final model including all variables.

**p ≤ .01; *p ≤ .05.