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Table 2 Odds Ratios Predicting Smoking Status Change

From: Motivation rulers for smoking cessation: a prospective observational examination of construct and predictive validity

  Overall Likelihood Ratio Test Chi Square1 Odds Ratio [95 % CI]:Continuous Smoking (0) versus Quit Attempt and Relapse (1) Odds Ratio [95 % CI]: Continuous Smoking (0) versus Successful Change (1)
Step 1: Covariables Alone – Nagelkerke R2 = 0.10 (this step stayed the same for all 5 models)
Age 0.52 1.00 [0.98–1.02] 1.01 [0.98–1.05]
Sex (Male/Female) 6.69* 1.97* [1.16–3.36] 0.97 [0.40–2.38]
Educational Level (> HS/< HS) 2.10 1.20 [0.65–2.22] 0.55 [0.21–1.43]
Race (Nonwhite/White) 10.26** 0.41** [0.24–0.72] 0.67 [0.25–1.77]
Nicotine Dependence 7.76* 0.96 [0.81–1.13] 0.67** [0.50–0.90]
Model 1: Importance – Nagelkerke R2 = 0.14  
Age 0.29 1.00 [0.98–1.02] 1.01 [0.98–1.05]
Sex (Male/Female) 7.89* 2.13** [1.24–3.68] 1.04 [0.42–2.58]
Educational Level (> HS/< HS) 2.13 1.33 [0.72–2.46] 0.62 [0.24–1.64]
Race (Nonwhite/White) 7.46* 0.46** [0.26–0.81] 0.76 [0.28–2.02]
Nicotine Dependence 6.58* 0.99 [0.83–1.17] 0.69* [0.51–0.93]
Importance 12.22** 1.17** [1.06–1.29] 1.18† [0.98–1.43]
Model 2: Readiness – Nagelkerke R2 = 0.13  
Age 0.26 1.00 [0.85–1.20] 1.01 [0.97–1.04]
Sex (Male/Female) 7.38* 2.07** [1.20–3.56] 0.99 [0.40–2.44]
Educational Level (> HS/< HS) 2.47 1.37 [0.73–2.55] 0.61 [0.23–1.59]
Race (Nonwhite/White) 8.64* 0.44** [0.25–0.77] 0.69 [0.26–1.83]
Nicotine Dependence 6.33* 1.01 [0.85–1.20] 0.69* [0.51–0.94]
Readiness 9.23* 1.13** [1.04–1.23] 1.09 [0.94–1.27]
Model 3: Confidence – Nagelkerke R2 = 0.13  
Age 0.05 1.00 [0.98–1.02] 1.00 [0.97–1.04]
Sex (Male/Female) 7.37* 2.06** [1.20–3.54] 1.01 [0.41–2.51]
Educational Level (> HS/< HS) 2.16 1.28 [0.69–2.38] 0.59 [0.22–1.55]
Race (Nonwhite/White) 7.79* 0.46** [0.26–0.80] 0.79 [0.30–2.13]
Nicotine Dependence 4.59 1.01 [0.85–1.20] 0.73* [0.54–0.99]
Confidence 10.78** 1.10* [1.02–1.19] 1.21* [1.04–1.39]
Model 4: Motivation Rulers Combined – Nagelkerke R2 = 0.16  
Age 0.20 1.00 [0.98–1.02] 1.01 [0.97–1.04]
Sex (Male/Female) 7.94* 2.15** [1.24–3.72] 1.07 [0.43–2.71]
Educational Level (> HS/< HS) 2.73 1.37 [0.74–2.55] 0.57 [0.21–1.53]
Race (Nonwhite/White) 6.98* 0.47* [0.27–0.83] 0.84 [0.31–2.28]
Nicotine Dependence 4.88† 1.01 [0.85–1.20] 0.72* [0.53–0.98]
Importance 4.22 1.11† [0.98–1.26] 1.16 [0.93–1.44]
Readiness 2.21 1.04 [0.92–1.19] 0.87 [0.70–1.09]
Confidence 5.48† 1.03 [0.93–1.15] 1.24* [1.03–1.53]
Model 5: Stage of change – Nagelkerke R2 = 0.20  
Age 0.00 1.00 [0.98–1.02] 1.00 [0.96–1.04]
Sex (Male/Female) 4.72† 1.81* [1.04–3.15] 0.99 [0.37–2.62]
Educational Level (> HS/< HS) 2.84 1.26 [0.66–2.35] 0.48 [0.17–1.34]
Race (Nonwhite/White) 8.87* 0.43** [0.24–0.76] 0.88 [0.32–2.47]
Nicotine Dependence 5.40† 1.01 [0.85–1.20] 0.69* [0.50–0.96]
Contemplation2 10.43** 2.50** [1.36–4.59] 0.46 [0.09–2.41]
Preparation2 18.81*** 3.06** [1.52–6.15] 6.49** [2.20–19.12]
  1. *p < 0.05, **p < 0.01, † p < 0.10. 1All of the likelihood ratio tests performed had two degrees of freedom. 2Stage of change was dummy coded, with precontemplation as the reference category.
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Addiction Science & Clinical Practice

ISSN: 1940-0640