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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: Drug Alcohol Depend. 2021 Nov 25;230:109185. doi: 10.1016/j.drugalcdep.2021.109185

Table 1.

Age and sex distribution of each group (mean, SD).

N Age Range Females
Control group 333 30.7 (9.76) 18 – 55 141
Cocaine dependent group 147 39.8 (9.14) 19 – 58 22
Subset co-dependent on nicotine 109 39.0 (9.22) 19 – 58 16
Methamphetamine dependent group 132 30.9 (7.67) 18 – 54 46
Subset co-dependent on nicotine 115 31.2 (7.77) 18 – 54 35
Nicotine dependent group 189 29.0 (9.94) 18 – 54 81