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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Addict Biol. 2012 Mar 28;18(3):581–592. doi: 10.1111/j.1369-1600.2012.00441.x

Table 3.

Demographic and clinical characteristics of samples (N = 19).

Characteristic Number of
studies
reporting		 Mean
(unweighted)		 Median Range
Average age for all participants 19 43.0 45.2 16.6 – 61.2
Difference in years of education (control – AUD) 14 1.7 1.8 −.4 – 3.5
Number of days abstinent at MRI scan 14 390.3 26.1 4.5 – 2229.0
Duration of AUD or heavy drinking in years 15 15.1 12.7 1.4 – 27.4
Lifetime consumption of pure ethanol in kg 9 776.8 644.4 103.2 – 1361.0
Percentage of AUD group who were current smokers 8 73.6 77.5 43.0 – 100