Table 1.

Sample characteristics

Variable	Percentage or mean (SD)	Range
Education (years)	12.19 (3.41)	4 – 21
Age	36.93 (8.78)	23 – 50
Sex (% men)	73%
Ethnicity (% Caucasian)	37%
Age of first MA use	24 (9.83)	13 – 47
Years of MA use	12.48 (8.46)	<1 – 32
DSM-IV MA abuse/dependence symptom count	6.00 (2.26)	2 – 11
Number of MA use days (past 30 days)	21.26 (8.15)	9 – 30
Primary route of MA use (n = 28)
Smoke	93%
Snort	3.5%
Inject	3.5%
Cigarette smokers (%)	63%
Alcohol drinkers (%)	70%
Number of alcohol-drinking days (past 30 days)	5.56 (8.63)	0 – 30
Alcohol drinks per drinking day (past 30 days)	4.07 (3.67)	<1 – 14

Abbreviations: DSM-IV, Diagnostic and Statistical Manual of Mental Disorders, 4th Edition; MA, methamphetamine.