Table 5.

Results of Logistic Regression of Taxon and Nontaxon Members in the 2003 National Survey on Drug Use and Health

Variable	Taxon M (SD)	Nontaxon M (SD)	Odds ratio	95% confidence interval
Age at first cigarette	14.12 (3.49)	15.26 (3.76)	0.945**	0.934–0.957
No. days smoked cigarettes in the past 30 days	28.47 (5.53)	17.69 (11.66)	1.132**	1.125–1.139
Buy cigarettes by pack (1) or carton (2)	1.31 (0.46)	1.08 (0.26)	3.725**	3.302–4.202
Perceived risk of smoking one or more packs of  cigarettes per day on a scale ranging from 1  (no risk) to 4 (great risk)	3.35 (0.74)	3.47 (0.72)	0.960	0.905–1.081
Alcohol abuse or dependence (past year; 1 = yes)	0.209 (0.41)	0.219 (0.42)	1.009	0.904–1.125
Marijuana abuse or dependence (past year; 1 = yes)	0.081 (0.27)	0.066 (0.25)	1.165	0.981–1.384
Illicit drug abuse or dependence (excluding  marijuana, past year; 1 = yes)	0.061 (0.24)	0.042 (0.18)	1.438*	1.154–1.793
Level of selected symptoms of emotional distress  (past year) on a scale of 0 to 24	7.01 (6.23)	5.70 (5.57)	1.040**	1.032–1.048
Overall health on a scale ranging from 1 (excellent)  to 5 (poor)	2.48 (0.95)	2.18 (0.91)	1.177**	1.122–1.235
Education level on a scale ranging from 1 (fifth  grade or less) to 11 (college senior/16th year or  higher)	7.94 (1.69)	8.43 (1.88)	0.887**	0.864–0.910
Income level on a scale from 1 (less than $20,000)  to 4 ($75,000 or more)	2.07 (0.95)	2.12 (1.03)	0.974	0.931–1.019

Note. Alcohol, marijuana, and illicit drug abuse or dependence assessed as meeting Diagnostic and Statistical Manual of Mental Disorders (4th ed., text rev.; American Psychological Association, 2000) abuse or dependence criteria for the respective drug category. Level of selected symptoms of emotional distress was calculated by assigning a value of 0 to 4 to each reported response regarding the frequency of six symptoms of distress: Nervous, feeling hopeless, restless or fidgety, so sad or depressed that nothing could cheer you up, everything was an effort, and feeling no good or worthless.

^*p < .01.

^**p < .0001.