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Table 2 Kruskal-Wallis Chi-Squares for the dichotomized stages of change groups indicating readiness to stop cigarette smoking

From: The barriers to smoking cessation in Swiss methadone and buprenorphine-maintained patients

  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 -
  1. * p < 0.05