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

Cooper, Sue; Foster, Katharine; Naughton, Felix; Leonardi-Bee, Jo; Sutton, Stephen; Ussher, Michael; Leighton, Matthew; Montgomery, Alan; Parrott, Steve; Coleman, Tim

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


Sue Cooper

Katharine Foster

Felix Naughton

Professor of Medical Statistics and Epidemiology

Stephen Sutton

Michael Ussher

Matthew Leighton

Director Nottingham Clinical Trials Unit

Steve Parrott

Professor of Primary Care



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%.


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

Trial registration NCT02043509. Registered 14 January 2014

Journal Article Type Article
Acceptance Date Dec 30, 2014
Publication Date Jan 27, 2015
Deposit Date Mar 26, 2015
Publicly Available Date Mar 26, 2015
Journal Trials
Electronic ISSN 1745-6215
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 16
Article Number 29
Keywords Smoking cessation, Pregnancy, Self-help, Randomised controlled trial, Protocol
Public URL
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