Pilot study to evaluate a tailored text message intervention for pregnant smokers (MiQuit): study protocol for a randomised controlled trial

Cooper, Sue and Foster, Katharine and Naughton, Felix and Leonardi-Bee, Jo and Sutton, Stephen and Ussher, Michael and Leighton, Matthew and Montgomery, Alan and Parrott, Steve and Coleman, Tim (2015) Pilot study to evaluate a tailored text message intervention for pregnant smokers (MiQuit): study protocol for a randomised controlled trial. Trials, 16 . 29/1-29/16. ISSN 1745-6215

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Abstract

Background

Smoking in pregnancy is a public health problem. Self-help smoking cessation support can help pregnant women to stop smoking, but the effects of delivering this kind of support via SMS text message are not known. A previous randomised controlled trial (RCT) demonstrated the feasibility and acceptability of providing such support to pregnant smokers using an automated, tailored text message intervention called MiQuit. This larger RCT will estimate key parameters for and will test the feasibility of delivering a major trial run within UK National Health Service settings aimed at providing definitive evidence on the utility of MiQuit for helping pregnant smokers to stop.

Methods & Design

A multi-centre, parallel group RCT. Participants are being identified in 16 English antenatal care settings and must be >16 years old, pregnant, < 25 weeks gestation, smoke >1 daily cigarette, have smoked >5 daily cigarettes before pregnancy, and able to understand texts in English. After consenting and collection of baseline data, participants are randomised to control or intervention groups in a 1:1 ratio; randomisation is stratified by trial site and gestation and employs computer generated pseudo-random code using random permuted blocks of randomly varying size, created by the Nottingham Clinical Trials Unit and held on a secure server. All participants receive a National Health Service (NHS) leaflet aimed at helping them to stop smoking. Intervention group women also receive the 12 week MiQuit intervention programme of tailored, supportive, interactive text message, self-help cessation support. Women are followed up by telephone 4 weeks after randomisation and at 36 weeks gestation. The study aims to recruit 400 women and although, for this kind of trial, formal sample size estimation for between-group comparisons is not appropriate, with this sample we will be able to estimate trial centres’ recruitment rates to within +/-1% (margin of error = half width of 95% confidence interval); individual trial groups’ ascertainment of rates for smoking outcomes between 4 weeks after randomisation until approximately 36 weeks gestation to within +/-4% and, across both groups, the combined cessation rate at 36 weeks +/-3%.

Discussion

Pilot trial completion will provide data to facilitate planning for a definitive trial investigating whether MiQuit works for smoking cessation in pregnancy.

Trial registration

ClinicalTrials.gov NCT02043509. Registered 14 January 2014

Item Type: Article
Additional Information: Link to licence: https://creativecommons.org/licenses/by/4.0/legalcode
Keywords: Smoking cessation, Pregnancy, Self-help, Randomised controlled trial, Protocol
Schools/Departments: University of Nottingham UK Campus > Faculty of Medicine and Health Sciences > School of Medicine > Division of Primary Care
University of Nottingham UK Campus > Faculty of Medicine and Health Sciences > School of Medicine > Division of Epidemiology and Public Health
Identification Number: https://doi.org/10.1186/S13063-014-0546-4
Depositing User: Whitemore, Rachel
Date Deposited: 26 Mar 2015 17:17
Last Modified: 13 Sep 2016 14:53
URI: http://eprints.nottingham.ac.uk/id/eprint/28554

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