Table 2.

Kruskal-Wallis Chi-Squares for the dichotomized stages of change groups indicating readiness to stop cigarette smoking

	Not ready	Ready	Chi-Square
Number of patients	92	11
% female	21.7	45.5	4.369*
Age	33.9; 7.6	32.5; 5.9	0.190
Cigarette Smoking
Age of smoking onset	14.2; 3.7	14.6; 2.7	2.419
Years of smoking	19.8; 7.4	17.8; 6.4	0.585
Number of cigarettes/day	15.5; 8.1	16.0; 7.0	0.008
FTND score	5.3; 2.1	6.5; 2.0	2.171
% nicotine replacement	1.1	0.0	-
Opiate and Maintenance History
Age at heroin onset	19.7; 6.0	21.4; 7.0	0.260
Number of opiate substitution enrollments	3.1; 5.0	2.8; 1.1	0.816
Total months of opiate substitution treatment	59.3; 41.5	71.0; 58.3	0.131
% substituted with methadone	84.8	72.8
Current methadone dose	125.4; 84.0	77.1; 34.0	1.964
% ever had an opiate withdrawal attempt	70.6	72.7	0.282
Total number of opiate withdrawal attempts	3.7; 2.6	5.7; 4.5	1.141
Co-dependence
% alcohol dependence	26.1	18.2	1.395
% cannabis dependence	21.7	18.2	0.855
% sedative dependence	39.1	18.2	1.637
% cocaine dependence	38.0	45.5	0.458
Number of co-dependencies other than nicotine	1.3; 0.9	1.0; 0.5	0.922
Dual Diagnoses
% depression	30.4	63.7	5.783*
% adult ADHD	3.3	0.0	-
% schizophreniform disorder	4.3	9.1	-

* p < 0.05