Logistic regression analysis of predictors of completed illegal cigarette sales by retail clerks to minors comparing non-smokers following a standard compliance check protocol to smoker's behaving naturally
| Variable | OR | 95% CI | p Value |
| Standard protocol | 1.0 | ||
| Smoker protocol | 5.7 | 1.5 to 22.0 | < 0.02 |
| Clerk ⩾ age 21 years | 1.0 | ||
| Clerk < age 21 years | 7.6 | 2.4 to 24.0 | < 0.001 |
| ID not requested | 1.0 | ||
| ID requested | 0.003 | 0 to 0.016 | < 0.001 |
OR, odds ratio; CI, confidence interval