. Author manuscript; available in PMC: 2018 Aug 1.

Published in final edited form as: Twin Res Hum Genet. 2018 Feb;21(1):12–23. doi: 10.1017/thg.2017.72

Table 6.

Statistics for Twin-Report Substance Use Measures

Measure	Mean (SD)	Internal Consistency (Cronbach’s α)
Nicotine Use (for those who reported smoking cigarettes)
Fagerstrom Test for Nicotine Dependence	2.25 (2.43)	0.59
Alcohol Use (for those who reported drinking alcohol)
DEP: Assertion	35.27 (6.73)	0.86
DEP: Affective change	21.09 (6.60)	0.87
DEP: Dependence	14.62 (4.10)	0.78
DEP: Sexual enhancement	16.69 (3.94)	0.76
DEP: Cognitive change	7.82 (2.60)	0.75
DEP: Tension reduction	10.26 (3.21)	0.63
AUDIT	6.18 (4.58)	0.79

Note: DEP=Drinking Expectancy Profile, AUDIT= Alcohol Use Disorders Identification Test