Prediction of salivary cotinine for usual brand smoking at trial 1 (n= 53)
| Measure | Semipartial correlation | Significance (P) | R2 |
|---|---|---|---|
| CPD | 0.21 | 0.102 | 0.12 |
| CPD × yield | 0.25 | 0.055 | 0.14 |
| CPD × yield × intake | 0.54 | <0.001 | 0.36 |
| CPD × intake elasticity | 0.61 | <0.001 | 0.41 |
NOTE: Linear regression, adjusting for time of saliva collection and gender.
Abbreviation: CPD, cigarettes per day.