Journal article

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

R Borland, H-H Yong, RJ O'Connor, A Hyland, ME Thompson

NICOTINE & TOBACCO RESEARCH | OXFORD UNIV PRESS | Published : 2010

Abstract

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 the relative utility of the standard categorical scoring compared with a continuous score using the square root of CPD minus the natural log of TTFC in minutes. RESULTS: We found considerable consiste..

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Grants

Awarded by National Cancer Institute of the United States


Awarded by Roswell Park Transdisciplinary Tobacco Use Research Center


Awarded by Robert Wood Johnson Foundation


Awarded by Canadian Institutes of Health Research


Awarded by National Health and Medical Research Council of Australia


Awarded by Cancer Research UK


Awarded by Canadian Tobacco Control Research Initiative


Awarded by NATIONAL CANCER INSTITUTE


Funding Acknowledgements

This research was funded by grants from the National Cancer Institute of the United States (R01 CA 100362), the Roswell Park Transdisciplinary Tobacco Use Research Center (P50 CA111236), Robert Wood Johnson Foundation (045734), Canadian Institutes of Health Research (57897 and 79551), National Health and Medical Research Council of Australia (265903 and 450110), Cancer Research UK (C312/A3726), and Canadian Tobacco Control Research Initiative (014578), with additional support from the Centre for Behavioural Research and Program Evaluation, National Cancer Institute of Canada/Canadian Cancer Society.