Weekly smoking: odds ratios (95% confidence intervals) for school level variables from multilevel logistic regression (models A–D)
| A | B | C | D | |
| Constant | −1.14 | −1.63 | −0.99 | −1.25 |
| Policy | ||||
| Strong | 1.00 | |||
| Average | 1.64 (0.93 to 2.89) | |||
| Weak | 2.55 (1.26 to 5.15) | |||
| Pupil enforcement | ||||
| High | 1.00 | |||
| Low | 1.32 (0.92 to 1.91) | |||
| Teacher enforcement | ||||
| High | 1.00 | |||
| Low | 0.86 (0.56 to 1.31) | |||
| School level variance (SE) | 0.233 (0.092) | 0.193 (0.084) | 0.223 (0.090) | 0.240 (0.093) |
| Wald χ2(df) | 6.80 (2) | 2.21 (1) | 0.52 (1) | |
| p Value for contrasts of terms (added to model): | p = 0.033 (A) | p = 0.138 (A) | p = 0.471 (A) | |