Daily smoking: odds ratios (95% confidence intervals) for school level variables from multilevel logistic regression (models A–D)
| A | B | C | D | |
| Constant | −1.42 | −2.22 | −1.24 | −1.40 |
| Policy | ||||
| Strong | 1.00 | |||
| Average | 2.30 (1.22 to 4.32) | |||
| Weak | 3.84 (1.76 to 8.37) | |||
| Pupil enforcement | ||||
| High | 1.00 | |||
| Low | 1.41 (0.96 to 2.07) | |||
| Teacher enforcement | ||||
| High | 1.00 | |||
| Low | 1.03 (0.66 to 1.59) | |||
| School level variance(SE) | 0.245 (0.101) | 0.146 (0.082) | 0.230 (0.099) | 0.257 (0.104) |
| Wald χ2 (df) | 12.65 (2) | 3.02 (1) | 0.01 (1) | |
| p Value for contrasts of terms (added to model) | p = 0.002 (A) | p = 0.082 (A) | p = 0.913 (A) |