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. Author manuscript; available in PMC: 2010 Jan 15.
Published in final edited form as: Biol Psychiatry. 2008 Sep 18;65(2):160–164. doi: 10.1016/j.biopsych.2008.07.030

Table 1.

Demographic and substance dependence variables for SDI and control samples. Dependence = number of subjects meeting DSM-IV criteria for dependence; abuse=number of subjects meeting DSM-IV criteria for abuse. Mean ± SD (range) are shown. *p<.005.

Controls (20) SDI (19)
Demographic
Age 33 ± 11 (23-50) 35 ± 7 (21-47)
Gender 6 M / 14 F 10 M / 9 F
IQ *112 ± 8 (91-130) 103 ±12 (80-121)
Education *14 ± 2 (12-19) 12 ± 3 (6-16)
Drug Dependence/abuse Last use (yrs)
Cocaine N/A 14 / 3 4.7 ± 4.8 (.2-18)
Alcohol N/A 13 / 2 3.2 ± 8.3 (.8-9)
Amphetamine N/A 12 / 2 2.4 ± 2.1 (1-8)
Cannabis N/A 11 /4 4.4 ± 4.6 (.2-16)
Opiate N/A 5 / 2 6.4 ± 7.4 (.2-22)
Club drugs N/A 1 / 2 5.3 ± 5.9 (1-18)
Hallucinogens N/A 1 / 9 8.0 ± 6.3 (.3-22)
Sedative N/A 1 / 4 5.7 ± 6.5 (.3-22)