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. 2015 Jan 19;12:2. doi: 10.1186/1477-7517-12-2

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© Borup et al.; licensee BioMed Central. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Equivalence ratio between current NRT use and recalled smoking. The regression line is based on a fractional polynomial regression and includes respondents using acute-acting single-dose NRT (N = 75). One outlier with high recalled cig/day and low NRT pieces/day was omitted (delta-beta = −8.1 SD). Logistic regression up to and including 25 cig/day showed a significant equivalence ratio of 0.86. No significance was found for those with recalled smoking of more than 25 cig/day.