Interventions for Promoting Smoking Cessation During Pregnancy (Review)

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Interventions for Promoting Smoking Cessation During Pregnancy (Review) Interventions for promoting smoking cessation during pregnancy (Review) Lumley J, Chamberlain C, Dowswell T, Oliver S, Oakley L, Watson L This is a reprint of a Cochrane review, prepared and maintained by The Cochrane Collaboration and published in The Cochrane Library 2009, Issue 3 http://www.thecochranelibrary.com Interventions for promoting smoking cessation during pregnancy (Review) Copyright © 2009 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. TABLE OF CONTENTS HEADER....................................... 1 ABSTRACT ...................................... 1 PLAINLANGUAGESUMMARY . 2 BACKGROUND .................................... 2 OBJECTIVES ..................................... 4 METHODS ...................................... 4 RESULTS....................................... 8 Figure1. ..................................... 10 Figure2. ..................................... 12 Figure3. ..................................... 13 DISCUSSION ..................................... 15 AUTHORS’CONCLUSIONS . 20 ACKNOWLEDGEMENTS . 21 REFERENCES ..................................... 21 CHARACTERISTICSOFSTUDIES . 37 DATAANDANALYSES. 130 Analysis 1.1. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 1 Continued smokinginlatepregnancy. 132 Analysis 1.2. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 2 Continued smoking in pregnancy subgrouped by risk of bias. .......... 135 Analysis 1.3. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 3 Continued smoking in late pregnancy by intensity of intervention. ............... 138 Analysis 1.4. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 4 Continued smoking in late pregnancy subgrouped by main intervention strategy. .............. 141 Analysis 1.5. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 5 Continued smoking (relapse) for spontaneous quitters in late pregnancy. ................. 144 Analysis 1.6. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 6 Mean birthweight. .................................. 145 Analysis 1.7. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 7 Mean birthweight subgrouped by main intervention strategy. .......... 146 Analysis 1.8. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 8 Low birthweight (under2500g). ................................. 148 Analysis 1.9. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 9 Very low birthweight(under1500g).. 149 Analysis 1.10. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 10 Perinatal deaths. .................................... 149 Analysis 1.11. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 11 Preterm birth (under37orunder36weeks). 150 Analysis 1.12. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 12 Stillbirths. 151 Analysis 1.13. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 13 Neonatal deaths. .................................... 151 Analysis 1.14. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 14 NICU admissions.................................... 152 Analysis 1.15. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 15 Smoking reduction: numbers of women reducing smoking in late pregnancy. ............... 153 Analysis 1.16. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 16 Smoking reduction: biochemical measures in late pregnancy. ........... 154 Analysis 1.17. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 17 Smoking reduction: self-reported mean cigarettes per day measured in late pregnancy or at delivery. 155 Analysis 1.18. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 18 Maintained smoking cessation at 1-5 months postpartum. ........ 156 Interventions for promoting smoking cessation during pregnancy (Review) i Copyright © 2009 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. Analysis 1.19. Comparison 1 Interventions for smoking cessation in pregnancy versus control, Outcome 19 Maintained smoking cessation at 6 to 12 months postpartum. ......... 157 APPENDICES ..................................... 158 WHAT’SNEW..................................... 159 HISTORY....................................... 160 CONTRIBUTIONSOFAUTHORS . 161 DECLARATIONSOFINTEREST . 161 SOURCESOFSUPPORT . 161 INDEXTERMS .................................... 162 Interventions for promoting smoking cessation during pregnancy (Review) ii Copyright © 2009 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. [Intervention Review] Interventions for promoting smoking cessation during pregnancy Judith Lumley2, Catherine Chamberlain1, Therese Dowswell3, Sandy Oliver4, Laura Oakley5, Lyndsey Watson2 13Centres Collaboration, Women and Children’s Program, Southern Health, Clayton South, Australia. 2Mother and Child Health Research, La Trobe University, Melbourne, Australia. 3Cochrane Pregnancy and Childbirth Group, School of Reproductive and Developmental Medicine, Division of Perinatal and Reproductive Medicine, The University of Liverpool, Liverpool, UK. 4Social Science Research Unit, Institute of Education, University of London, London, UK. 5Non-communicable Disease Epidemiology Unit, London School of Hygiene and Tropical Medicine, London, UK Contact address: Catherine Chamberlain, 3Centres Collaboration, Women and Children’s Program, Southern Health, Locked Bag 29, Clayton South, Victoria, 3169, Australia. [email protected]. Editorial group: Cochrane Pregnancy and Childbirth Group. Publication status and date: New search for studies and content updated (no change to conclusions), published in Issue 3, 2009. Review content assessed as up-to-date: 3 December 2008. Citation: Lumley J, Chamberlain C, Dowswell T,Oliver S, Oakley L, Watson L. Interventions for promoting smoking cessation during pregnancy. Cochrane Database of Systematic Reviews 2009, Issue 3. Art. No.: CD001055. DOI: 10.1002/14651858.CD001055.pub3. Copyright © 2009 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. ABSTRACT Background Tobacco smoking in pregnancy remains one of the few preventable factors associated with complications in pregnancy, low birthweight, preterm birth and has serious long-term health implications for women and babies. Smoking in pregnancy is decreasing in high-income countries and increasing in low- to middle-income countries and is strongly associated with poverty, low educational attainment, poor social support and psychological illness. Objectives To assess the effects of smoking cessation interventions during pregnancy on smoking behaviour and perinatal health outcomes. Search strategy We searched the Cochrane Pregnancy and Childbirth Group’s Trials Register (June 2008), the Cochrane Tobacco Addiction Group’s Trials Register (June 2008), EMBASE, PsycLIT, and CINAHL (all from January 2003 to June 2008). We contacted trial authors to locate additional unpublished data. Selection criteria Randomised controlled trials where smoking cessation during pregnancy was a primary aim of the intervention. Data collection and analysis Trials were identified and data extracted by one person and checked by a second. Subgroup analysis was conducted to assess the effect of risk of trial bias, intensity of the intervention and main intervention strategy used. Interventions for promoting smoking cessation during pregnancy (Review) 1 Copyright © 2009 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. Main results Seventy-two trials are included. Fifty-six randomised controlled trials (over 20,000 pregnant women) and nine cluster-randomised trials (over 5000 pregnant women) provided data on smoking cessation outcomes. There was a significant reduction in smoking in late pregnancy following interventions (risk ratio (RR) 0.94, 95% confidence interval (CI) 0.93 to 0.96), an absolute difference of six in 100 women who stopped smoking during pregnancy. However, there is significant heterogeneity in the combined data (I2 > 60%). In the trials with the lowest risk of bias, the interventions had less effect (RR 0.97, 95% CI 0.94 to 0.99), and lower heterogeneity (I2 = 36%). Eight trials of smoking relapse prevention (over 1000 women) showed no statistically significant reduction in relapse. Smoking cessation interventions reduced low birthweight (RR 0.83, 95% CI 0.73 to 0.95) and preterm birth (RR 0.86, 95% CI 0.74 to 0.98), and there was a 53.91g (95% CI 10.44 g to 95.38 g) increase in mean birthweight. There were no statistically significant differences in neonatal intensive care unit admissions, very low birthweight, stillbirths, perinatal or neonatal mortality but these analyses had very limited power. Authors’ conclusions Smoking cessation interventions in pregnancy reduce the proportion of women who continue to smoke in late pregnancy, and reduce low birthweight and preterm birth. Smoking cessation interventions in pregnancy need to be implemented in all maternity care settings. Given the difficulty many pregnant women addicted to tobacco have quitting during pregnancy, population-based measures to reduce smoking and social inequalities
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