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. 2016 Feb 26;18(9):1915–1919. doi: 10.1093/ntr/ntw026

Table 1.

Mean, SD, t Value, and Chi-Square Value for Comparisons Between Group Means

Measure (range) Group Hedge’s g
Cocaine-using Non-cocaine-using
Mean SD Mean SD Test of significance
Age 41.2 (7.0) 38.3 (12.4) t (38) = 0.9
Females 8 12 χ2 (1) = 1.6
Race χ2 (2) = 5.0
 African American 15 8
 Caucasian 4 10
 Other 1 2
Years of education 12.1 (1.2) 12.5 (1.0) t (38) = 1.3
DAST (0–28) 12.9 (5.6) 3.0 (2.1) t (38) = 7.4* 2.3
MAST (0 – 53) 10.2 (10.3) 3.6 (4.2) t (38) = 2.7* 0.8
Cigarette use
 Cigarettes per day 15.7 (4.7) 16.1 (4.3) t (38) = 0.3
 Minutes since last cigarettea 192.5 (244.3) 146.3 (193.9) t (38) = 0.7
 Carbon monoxide level 18.5 (10.9) 17.1 (8.6) t (38) = 0.5
 FTND (0–10) 5.3 (2.1) 4.5 (1.6) t (38) = 1.4
 MNWS (total) (0–60) 5.4 (5.3) 8.7 (7.7) t (38) = 1.6
 QSU (0–100)
  Factor 1 73.9 (30.4) 69.3 (27.0) t (38) = 0.5
  Factor 2 40.9 (28.8) 24.2 (22.3) t (38) = 2.1* 0.6
Cocaine use
 Days since last use 2.6 (4.0)
 Days used past month 12.8 (6.1)
 Days used past 3 months 38.9 (21.3)
 Years used 16.7 (7.3)

DAST = Drug Abuse Screening Test; FTND = Fagerström Test of Nicotine Dependence; MAST = Michigan Alcoholism Screening Test; MNWS = Minnesota Nicotine Withdrawal Scale; QSU = Questionnaire of Smoking Urges-Brief. Effect size (Hedge’s g) reported for significant group differences.

aMinutes since last cigarette prior to start of session.

*Significant difference between groups, P < .05.