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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Addict Behav. 2011 Aug 5;36(12):1253–1260. doi: 10.1016/j.addbeh.2011.07.040

Table 1.

Demographics and smoking characteristics compared across study samples.

Full
(n=204)		 Study 1
(substance
use
treatment;
n=30)		 Study 2
(psychiatric
inpatient;
n=67)		 Study 3
(Emergency
department;
n=33)		 Study 4
(School
sample;
n=74)		 p
Demographics
    Age (M (SD)) 15.99 16.49 15.43 16.09 16.24 .000
(1.27) (1.01) (1.29) (1.28) (1.19)
    Gender (% male) 44 60 36 58 38 .036
    Ethnicity (% White) 78 63 97 70 69 .000
Smoking Variables
    Age 1st smoked (M 11.97 11.90 11.34 12.81 (2.45) 12.18 .030
    (SD)) (2.44) (2.18) (2.18) (2.65)
    Ever tried to quit
    (%)		 84 83 75 97 87 .043
    Daily smokers (%) 51 53 40 52 58 .202
    Cigarettes per day 10.61 9.96 (8.51) 13.64 9.59 (6.79) 8.60 (5.93) .001
    (M (SD)) (7.54) (8.20)