Table 2.
Bivariate Polytomous Logistic Regression Models Predicting Long-Term Smoking Status
| Independent Variable | Continuous Smoker v Continuous Quitter
|
Relapsed at Follow-Up v Continuous Quitter
|
Quit at Follow-Up v Continuous Quitter
|
Overall P for Significance | |||
|---|---|---|---|---|---|---|---|
| OR | 95% CI | OR | 95% CI | OR | 95% CI | ||
| Intervention condition | |||||||
| SH | 1.86 | 0.98 to 3.55 | 0.64 | 0.27 to 1.48 | 1.59 | 0.77 to 3.32 | .0018 |
| Peer counseling | 1.0 | 1.0 | 1.0 | ||||
| Sex | |||||||
| Female | 0.66 | 0.35 to 1.24 | 0.54 | 0.24 to 1.22 | 0.63 | 0.31 to 1.30 | .5068 |
| Male | 1.0 | 1.0 | 1.0 | ||||
| Age, 1-year increment from mean of 30.8 years* | 0.94 | 0.90 to 0.98 | 0.92 | 0.87 to 0.98 | 0.95 | 0.90 to 1.00 | .0363 |
| Nicotine dependence | |||||||
| Yes | 2.08 | 1.09 to 3.99 | 1.18 | 0.52 to 2.67 | 1.53 | 0.74 to 3.19 | .0251 |
| No | 1.0 | 1.0 | 1.0 | ||||
| Race/ethnicity | |||||||
| Nonwhite | 1.81 | 0.54 to 6.03 | 0.23 | 0.02 to 2.32 | 1.68 | 0.45 to 6.29 | .1772 |
| White | 1.0 | 1.0 | 1.0 | ||||
| Education, at follow-up | |||||||
| < high school | 2.96 | 0.63 to 13.85 | 1.22 | 0.18 to 8.46 | 0.42 | 0.05 to 3.32 | .0169 |
| High school | 1.98 | 0.75 to 5.23 | 0.70 | 0.19 to 2.60 | 1.20 | 0.41 to 3.53 | |
| Posthigh school | 1.66 | 0.78 to 3.54 | 0.38 | 0.13 to 1.14 | 1.15 | 0.50 to 2.65 | |
| College | 1.0 | ||||||
| Marital status, at follow-up | |||||||
| Single | 2.85 | 1.21 to 6.75 | 0.80 | 0.22 to 2.85 | 1.80 | 0.70 to 4.64 | .0077 |
| Widow/divorce | 3.03 | 1.02 to 9.95 | 1.12 | 0.25 to 4.97 | 1.98 | 0.61 to 6.46 | |
| Married | 1.0 | ||||||
| Cancer type | |||||||
| Bone/STS/Wilms’ | 0.75 | 0.36 to 1.55 | 1.04 | 0.42 to 2.60 | 0.55 | 0.24 to 1.29 | .6928 |
| CNS | 0.70 | 0.31 to 1.59 | 0.79 | 0.27 to 2.31 | 0.62 | 0.24 to 1.61 | |
| Leukemia/lymphoma | 1.0 | ||||||
| Used nicotine replacement therapy | |||||||
| No | 2.71 | 1.33 to 5.52 | 0.57 | 0.25 to 1.33 | 1.29 | 0.57 to 2.89 | .0001 |
| Yes | 1.0 | 1.0 | 1.0 | ||||
| Cancer at follow-up | |||||||
| Yes | 1.15 | 0.56 to 2.32 | 1.25 | 0.52 to 2.98 | 1.36 | 0.62 to 2.97 | .7907 |
| No | 1.0 | 1.0 | 1.0 | ||||
| Household income | |||||||
| < 19,999 | 4.71 | 1.07 to 20.77 | 1.50 | 0.16 to 14.50 | 2.50 | 0.41 to 15.29 | .1673 |
| 20,000-39,999 | 1.75 | 0.51 to 5.96 | 0.71 | 0.10 to 5.20 | 1.93 | 0.42 to 8.93 | |
| 40,000-59,999 | 2.29 | 0.62 to 8.53 | 2.50 | 0.36 to 17.39 | 2.88 | 0.58 to 14.33 | |
| 60,000-79,999 | 1.26 | 0.34 to 4.77 | 1.50 | 0.20 to 11.14 | 2.00 | 0.39 to 10.20 | |
| 80,000-99,999 | 2.59 | 0.42 to 15.90 | 4.00 | 0.36 to 44.35 | 4.00 | 0.50 to 32.13 | |
| More than 100,000 | Referent | ||||||
| No. of cigarettes/day, 1 cigarette increment from mean of 14.4* | 1.07 | 1.03 to 1.12 | 1.04 | 0.98 to 1.09 | 1.04 | 0.99 to 1.09 | .0002 |
| Age at first smoking, 1 year increment from mean of 17 years* | 0.98 | 0.90 to 1.07 | 1.03 | 0.90 to 1.16 | 1.02 | 0.92 to 1.12 | .5790 |
| Situational self-efficacy, 1 unit increment from mean of 8.59* | 0.87 | 0.78 to 0.98 | 0.91 | 0.79 to 1.05 | 0.87 | 0.76 to 0.98 | .0973 |
| Confident can quit smoking in 1 month | |||||||
| Not at all | 7.60 | 2.76 to 20.92 | 2.00 | 0.46 to 8.65 | 5.38 | 1.46 to 19.88 | .0003 |
| A little | 5.50 | 1.86 to 16.23 | 5.25 | 1.23 to 22.44 | 4.00 | 1.00 to 16.03 | |
| Somewhat | 5.27 | 1.88 to 14.83 | 2.80 | 0.66 to 11.95 | 4.00 | 1.05 to 15.26 | |
| Very | 3.27 | 0.96 to 11.20 | 2.80 | 0.53 to 14.78 | 5.76 | 1.29 to 25.71 | |
| Extremely | 1.0 | ||||||
| Short-term self-efficacy | |||||||
| Low | 3.58 | 1.69 to 7.62 | 1.99 | 0.74 to 5.33 | 1.70 | 0.72 to 4.00 | .0098 |
| Medium | 2.81 | 1.17 to 6.75 | 1.66 | 0.53 to 5.19 | 1.41 | 0.52 to 3.85 | |
| High | 1.0 | ||||||
| Situational self efficacy, 1 unit change from mean of 8.59* | 0.87 | 0.78 to 0.98 | 0.91 | 0.79 to 1.05 | 0.87 | 0.76 to 0.98 | .0973 |
| Stage of change at baseline | |||||||
| Precontemplation | 1.16 | 0.51 to 2.66 | 0.38 | 0.12 to 1.25 | 0.54 | 0.20 to 1.46 | .0200 |
| Early contemplation | 1.65 | 0.73 to 3.76 | 0.51 | 0.17 to 1.55 | 1.16 | 0.46 to 2.90 | |
| Contemplation | 1.86 | 0.67 to 5.14 | 1.04 | 0.30 to 3.55 | 0.97 | 0.30 to 3.09 | |
| Preparation | 1.0 | ||||||
NOTE. Reference group being continuous quitters to 8 months to long-term follow-up.
Abbreviations: OR, odds ratio; SH, self-help; STS, soft tissue sarcoma.
*
These variables are coded as continuous variables in the model, the referent value is the mean.