dc.contributor |
Háskólinn í Reykjavík |
dc.contributor |
Reykjavík University |
dc.contributor.author |
Öhrvik, John |
dc.contributor.author |
Helgason, Asgeir R. |
dc.contributor.author |
Nohlert, Eva |
dc.date.accessioned |
2018-11-14T15:13:52Z |
dc.date.available |
2018-11-14T15:13:52Z |
dc.date.issued |
2016-02-03 |
dc.identifier.citation |
Nohlert, E., Öhrvik, J., Helgason, Á. R. (2016). Non-responders in a quitline evaluation are more likely to be smokers – a drop-out and long-term follow-up study of the Swedish National Tobacco Quitline. Tobacco Induced Diseases, 14(February), 5. https://doi.org/10.1186/s12971-016-0070-2 |
dc.identifier.issn |
2070-7266 |
dc.identifier.issn |
1617-9625 (eISSN) |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/898 |
dc.description.abstract |
Background: A previous randomized controlled trial (RCT) of the Swedish National Tobacco Quitline detected no significant differences in smoking cessation outcomes between proactive and reactive services at 12-month follow-up. However, the response rate was only 59 % and non-responders were over-represented in the proactive service. We performed a drop-out analysis to assess the smoking status of initial responders and non-responders.
Methods: At 29–48 months after the first call, a postal questionnaire with six questions was sent to 150 random clients from the RCT database, with equal numbers from the proactive and reactive services as well as responders and non-responders at 12-month follow-up. Clients who did not return the questionnaire were contacted by telephone. The outcome measures were point prevalence (PP) and 6-month continuous abstinence (CA), and
their associations with response status at 12 months were assessed by logistic regression.
Results: The response rate was 74 % (111/150). Abstinence was significantly higher among initial responders than non-responders (PP 54 % vs. 32 %, p = .023 and CA 49 % vs. 21 %, p = .003). The odds ratios for initial responders vs. initial non-responders were, for PP = 2.5 (95 % CI 1.1–5.6, p = .024), and for CA = 3.7 (95 % CI 1.5–8.9, p = .004), after adjusting for proactive/reactive service.
Conclusions: Non-responders to a 12-month follow-up smoking cessation questionnaire in a quitline setting were more likely to be smokers 1.5–3 years later. We propose a conservative correction factor of 0.8 for self-reported abstinence in telephone-based cessation studies if the response rate is approximately 55–65 %.
Keywords: Effectiveness, Intention-to-treat, Non-response, Per protocol, Proactive, Reactive, Responder-only analysis, Smoking, Telephone, Questionnaire |
dc.description.sponsorship |
The authors declare that they have no competing interests. The study was supported by grants from the Swedish Heart and Lung Association, the Swedish Heart Lung Foundation, the Swedish Cancer Society, the Swedish Research Council, the Swedish Research Council for Health, Working Life and Welfare, and the County Councils of Stockholm and Vastmanland, Sweden. The funding agents had no role in the study design, collection, analysis or interpretation of the data, writing the manuscript, or the decision to submit the paper for publication. |
dc.format.extent |
5 |
dc.language.iso |
en |
dc.publisher |
E.U. European Publishing |
dc.relation.ispartofseries |
Tobacco Induced Diseases;14(February) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Effectiveness |
dc.subject |
Intention to treat |
dc.subject |
Non response |
dc.subject |
Per protocol |
dc.subject |
Proactive |
dc.subject |
Reactive |
dc.subject |
Responder only analysis |
dc.subject |
Smoking |
dc.subject |
Telephone |
dc.subject |
Questionnaire |
dc.subject |
Reykingar |
dc.subject |
Fíkn |
dc.subject |
Félagsleg viðfangsefni |
dc.subject |
Megindlegar rannsóknir |
dc.title |
Non-responders in a quitline evaluation are more likely to be smokers – a drop-out and long-term follow-up study of the Swedish National Tobacco Quitline |
dc.type |
info:eu-repo/semantics/article |
dcterms.license |
© 2016 Nohlert et al. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0
International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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. |
dc.description.version |
Peer Reviewed |
dc.identifier.journal |
Tobacco Induced Diseases |
dc.identifier.doi |
10.1186/s12971-016-0070-2 |
dc.relation.url |
http://link.springer.com/content/pdf/10.1186/s12971-016-0070-2 |
dc.contributor.school |
Viðskiptadeild (HR) |
dc.contributor.school |
School of Business (RU) |