Table 2.

Prediction of salivary cotinine for usual brand smoking at trial 1 (n= 53)

MeasureSemipartial correlationSignificance (P)R2
CPD0.210.1020.12
CPD × yield0.250.0550.14
CPD × yield × intake0.54<0.0010.36
CPD × intake elasticity0.61<0.0010.41
  • NOTE: Linear regression, adjusting for time of saliva collection and gender.

  • Abbreviation: CPD, cigarettes per day.