The reliability and predictive validity of the Heaviness of Smoking Index and its two components: findings from the International Tobacco Control Four Country study.

@article{Borland2010TheRA,
  title={The reliability and predictive validity of the Heaviness of Smoking Index and its two components: findings from the International Tobacco Control Four Country study.},
  author={Ron Borland and Hua-Hie Yong and Richard J O'Connor and Andrew Hyland and Mary E. Thompson},
  journal={Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco},
  year={2010},
  volume={12 Suppl},
  pages={S45-50}
}
BACKGROUND There is increasing recognition that the two measures in the Heaviness of Smoking Index (HSI), time to first cigarette of the day (TTFC) and daily consumption (cigarettes per day [CPD]), are strong predictors of quitting behavior. METHODS Use of Waves 1-4 of International Tobacco Control cohort with around 8,000 respondents per wave and 6,000 for prediction of quit outcomes at the next wave. We measured TTFC and CPD at each wave and quit outcomes at the next wave. We also looked at… CONTINUE READING