Predictors of smoking cessation during pregnancy: a systematic review and meta-analysis
Corresponding Author
Muhammad Riaz
College of Medicine, Biological Sciences and Psychology, Department of Health Sciences, University of Leicester, Leicester, UK
Correspondence to: Muhammad Riaz, College of Medicine, Biological Sciences and Psychology, Department of Health Sciences, University of Leicester, Centre for Medicine, University Road, Leicester LE1 7RH, UK. E-mail: [email protected]Search for more papers by this authorSarah Lewis
Division of Epidemiology and Public Health and UK Centre for Tobacco and Alcohol Studies, University of Nottingham, Nottingham, UK
Search for more papers by this authorFelix Naughton
School of Health Sciences, University of East Anglia, Norwich, UK
Search for more papers by this authorMichael Ussher
Population Health Research Institute, St George's University of London, London, UK
Search for more papers by this authorCorresponding Author
Muhammad Riaz
College of Medicine, Biological Sciences and Psychology, Department of Health Sciences, University of Leicester, Leicester, UK
Correspondence to: Muhammad Riaz, College of Medicine, Biological Sciences and Psychology, Department of Health Sciences, University of Leicester, Centre for Medicine, University Road, Leicester LE1 7RH, UK. E-mail: [email protected]Search for more papers by this authorSarah Lewis
Division of Epidemiology and Public Health and UK Centre for Tobacco and Alcohol Studies, University of Nottingham, Nottingham, UK
Search for more papers by this authorFelix Naughton
School of Health Sciences, University of East Anglia, Norwich, UK
Search for more papers by this authorMichael Ussher
Population Health Research Institute, St George's University of London, London, UK
Search for more papers by this authorAbstract
Aim
To identify factors found in the research literature to be associated with smoking cessation in pregnancy.
Methods
Electronic searches of the bibliographic databases of PubMed, EMBASE, PsycINFO, Elsevier, Scopus and ISI Web of Science were conducted to April 2017. All studies reporting factors associated with smoking cessation or continuing smoking during pregnancy were included and reviewed systematically, irrespective of study design. The Newcastle–Ottawa Quality Assessment Scale was used to assess the study quality. The DerSimonian & Laird random-effects model was used to conduct meta-analyses, and where effect estimates were reported for factors included in at least three studies.
Results
Fifty-four studies, including 505 584 women globally who smoked before pregnancy, 15 clinical trials and 40 observational studies, were included in the review and 36 (65.5%) were considered to be of high quality. This review identified 11 socio-demographic, seven socially related, 19 smoking behaviour-related, five pregnancy-related, six health-related and six psychological factors that were associated significantly with smoking cessation during pregnancy. The most frequently observed significant factors associated with cessation were: higher level of education, pooled odds ratio (OR), 95% confidence interval (CI) = 2.16 (1.80–2.84), higher socio-economic status: 1.97 (1.20–3.24), overseas maternal birth: 2.00 (1.40–2.84), Medicaid coverage or private insurance: 1.54 (1.29–1.85), living with partner or married: 1.49 (1.38–1.61), partner/other members of the household do not smoke: 0.42 (0.35–0.50), lower heaviness of smoking index score: 0.45 (0.27–0.77, lower baseline cotinine level: 0.78 (0.64–0.94), low exposure to second-hand smoking: 0.45 (0.20–1.02), not consuming alcohol before and/or during pregnancy: 2.03 (1.47–2.80), primiparity: 1.85 (1.68–2.05), planned breastfeeding:1.99 (1.94–2.05), perceived adequate pre-natal care: 1.74 (1.38–2.19), no depression: 2.65 (1.62–4.30) and low stress during pregnancy: 0.58 (0.44–0.77).
Conclusion
A wide range of socio-demographics, relationship, social, smoking-related, pregnancy-related, health and psychological factors have been found to predict smoking cessation in pregnancy.
Supporting Information
Filename | Description |
---|---|
add14135-sup-0001-supplementary_tables.docxWord 2007 document , 170.2 KB |
Table S1 Characteristics of studies included in the systematic review. Table S2 Scores using Newcastle Ottawa Quality Assessment Scale (NOQAS) for cohorta studies. Table S3 Scores using modified Newcastle Ottawa Quality Assessment Scale (MNOQAS) for cross-sectional studies. Figure S2 Forest plots: pooled(c,h,i) odds ratios(a,b) for the factors associated significantly with smoking cessation during pregnancy reported by three or more studies. |
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
References
- 1Kallen K. The impact of maternal smoking during pregnancy on delivery outcome. Eur J Public Health 2001; 11: 329–333.
- 2Rogers J. M. Tobacco and pregnancy. Reprod Toxicol 2009; 28: 152–160.
- 3Murphy D. J., Dunney C., Mullally A., Adnan N., Deane R. Population-based study of smoking behaviour throughout pregnancy and adverse perinatal outcomes. Int J Environ Res Public Health 2013; 10: 3855–3867.
- 4Salihu H. M., Wilson R. E. Epidemiology of prenatal smoking and perinatal outcomes. Early Hum Dev 2007; 83: 713–720.
- 5Toivonen S., Heinonen S., Anttila M., Kosma V. M., Saarikoski S. Reproductive risk factors, Doppler findings, and outcome of affected births in placental abruption: a population-based analysis. Am J Perinatol 2002; 19: 451–456.
- 6Cooper A. R., Moley K. H. Maternal tobacco use and its preimplantation effects on fertility: more reasons to stop smoking. Semin Reprod Med 2008; 26: 204–212.
- 7Doll R., Peto R., Boreham J., Sutherland I. Mortality from cancer in relation to smoking: 50 years observations on British doctors. Br J Cancer 2005; 92: 426–429.
- 8Cnattingius S. The epidemiology of smoking during pregnancy: smoking prevalence, maternal characteristics, and pregnancy outcomes. Nicotine Tob Res 2004; 6: S125–40.
- 9 NHS Information Centre Infant Feeding Survey 2010: Early results. Leeds, England: National Health Service Information Centre for Health and Social Care; 2011.
- 10Tong V. T., Dietz P. M., Morrow B., D'Angelo D. V., Farr S. L., Rockhill K. M. et al. Trends in smoking before, during, and after pregnancy—Pregnancy Risk Assessment Monitoring System, United States, 40 sites, 2000–2010. Morb Mort Wlky Rep Surveill Summ 2013; 62: 1–19.
- 11Al-Sahab B., Saqib M., Hauser G., Tamim H. Prevalence of smoking during pregnancy and associated risk factors among Canadian women: a national survey. BMC Pregnancy Childbirth 2010; 10: 24.
- 12Tappin D. M., MacAskill S., Bauld L., Eadie D., Shipton D., Galbraith L. Smoking prevalence and smoking cessation services for pregnant women in Scotland. Subst Abuse Treat Prev Policy 2010; 5: 1.
- 13Richmond R. You've come a long way baby: women and the tobacco epidemic. Addiction 2003; 98: 553–557.
- 14Dias-Damé J. L., Cesar J. A. Disparities in prevalence of smoking and smoking cessation during pregnancy: a population-based study. Biomed Res Int 2015; 2015: 345430.
- 15Silveira M. F., Matijasevich A., Menezes A. M., Horta B. L., Santos I. S., Barros A. J. et al. Secular trends in smoking during pregnancy according to income and ethnic group: four population-based perinatal surveys in a Brazilian city. BMJ Open 2016; 6: e010127.
- 16Bloch M., Althabe F., Onyamboko M., Kaseba-Sata C., Castilla E. E., Freire S. et al. Tobacco use and secondhand smoke exposure during pregnancy: an investigative survey of women in 9 developing nations. Am J Public Health 2008; 98: 1833–1840.
- 17Chamberlain C., O'Mara-Eves A., Oliver S., Caird J. R., Perlen S. M., Eades S. J. et al. Psychosocial interventions for supporting women to stop smoking in pregnancy. Cochrane Database Syst Rev 2013; Issue 10. Art. No.: CD001055. https://doi.org/10.1002/14651858.CD001055.pub4.
- 18Jones M., Lewis S., Parrott S., Wormall S., Coleman T. Re-starting smoking in the postpartum period after receiving a smoking cessation intervention: a systematic review. Addiction 2016; 111: 981–990.
- 19Tappin D., Bauld L., Purves D., Boyd K., Sinclair L., MacAskill S. et al. Cessation in Pregnancy Incentives Trial Team. Financial incentives for smoking cessation in pregnancy: randomised controlled trial. BMJ 2015; 27; 350: h134.
- 20Lumley J., Chamberlain C., Dowswell T., Oliver S., Oakley L., Watson L. Interventions for promoting smoking cessation during pregnancy. Cochrane Database Syst Rev 2009; Issue 3. Art. No.: CD001055. https://doi.org/10.1002/14651858.CD001055.pub3.
- 21Krstev S., Marinković J., Simić S., Kocev N., Bondy S. J. Prevalence and predictors of smoking and quitting during pregnancy in Serbia: results of a nationally representative survey. Int J Public Health 2012; 57: 875–883.
- 22West R. The multiple facets of cigarette addiction and what they mean for encouraging and helping smokers to stop. COPD 2009; 6: 277–283.
- 23Schneider S., Huy C., Schütz J., Diehl K. Smoking cessation during pregnancy: a systematic literature review. Drug Alcohol Rev 2010; 29: 81–90.
- 24Moher D., Liberati A., Tetzlaff J., Altman D. G., PRISMA Group Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. BMJ 2009; 339: b2535.
- 25Solomon L., Quinn V. Spontaneous quitting: self initiated smoking cessation in early pregnancy. Nicotine Tob Res 2004; 6: 203–216.
- 26Moore E., Blatt K., Chen A., Van Hook J., DeFranco E. A. Factors associated with smoking cessation in pregnancy. Am J Perinatol 2016; 33: 560–568.
- 27DerSimonian R., Laird N. Meta-analysis in clinical trials. Control Clin Trials 1986; 7: 177–188.
- 28Wells G., Shea B., O'Connell D., Peterson J., Welch V., Losos M. et al. The Newcastle–Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta analyses. Available at: http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp (accessed 30 December 2017) (Archived at http://www.webcitation.org/6w64XhsHY on 30th December 2017).
- 29Herzog R., Álvarez-Pasquin M. J., Díaz C., Del Barrio J. L., Estrada J. M., Gil Á. Are healthcare workers’ intentions to vaccinate related to their knowledge, beliefs and attitudes? A systematic review. BMC Public Health 2013; 13: 154.
- 30Colman G. J., Joyce T. Trends in smoking before, during, and after pregnancy in ten states. Am J Prev Med 2003; 24: 29–35.
- 31Coleman-Cowger V. H., Koszowski B., Rosenberry Z. R., Terplan M. Factors associated with early pregnancy smoking status among low-income smokers. Matern Child Health J 2016; 20: 1054–1060.
- 32de Vries H., Backbier E. Self-efficacy as an important determinant of quitting among pregnant women who smoke: the phi-pattern. Prev Med 1994; 23: 167–174.
- 33Erlingsdottir A., Sigurdsson E. L., Jonsson J. S., Kristjansdottir H., Sigurdsson J. A. Smoking during pregnancy: childbirth and health study in primary care in Iceland. Scand J Prim Health Care 2014; 32: 11–16.
- 34Fisher N., Amitai Y., Haringman M., Meiraz H. The prevalence of smoking among pregnant and postpartum women in Israel: a national survey and review. Health Policy 2005; 73: 1–9.
- 35Goedhart G., van der Wal M. F., Cuijpers P., Bonsel G. J. Psychosocial problems and continued smoking during pregnancy. Addict Behav 2009; 34: 403–406.
- 36Grangé G., Vayssière C., Borgne A. Characteristics of tobacco withdrawal in pregnant women. Eur J Obstet Gynecol Reprod Biol 2006; 125: 38–43.
- 37Haskins A., Bertone-Johnson E., Pekow P., Carbone E., Chasan-Taber L. Correlates of smoking cessation at pregnancy onset among Hispanic women in Massachusetts. Am J Health Promot 2010; 25: 100–108.
- 38Jané M., Nebot M., Badí M., Berjano B., Muñoz M., Rodríguez M. C. et al. Determinant factors of smoking cessation during pregnancy. Med Clin (Barc) 2000; 114: 132–135.
- 39Kaneita Y., Tomofumi S., Takemura S., Suzuki K., Yokoyama E., Miyake T. et al. Prevalence of smoking and associated factors among pregnant women in Japan. Prev Med 2007; 45: 15–20.
- 40Lai M.-C., Chou F.-S., Yang Y.-J., Wang C.-C., Lee M.-C. Tobacco use and environmental smoke exposure among taiwanese pregnant smokers and recent quitters: risk perception, attitude, and avoidance behavior. Int J Environ Res Public Health 2013; 10: 4104–4116.
- 41Palma S., Pérez-Iglesias R., Pardo-Crespo R., Llorca J., Mariscal M., Delgado-Rodríguez M. Smoking among pregnant women in Cantabria (Spain): trend and determinants of smoking cessation. BMC Public Health 2007; 7: 65.
- 42Suzuki J., Kikuma H., Kawaminami K., Shima M. Predictors of smoking cessation during pregnancy among the women of Yamato and Ayase municipalities in Japan. Public Health 2005; 119: 679–685.
- 43Smedberg J., Lupattelli A., Mårdby A. C., Nordeng H. Characteristics of women who continue smoking during pregnancy: a cross-sectional study of pregnant women and new mothers in 15 European countries. BMC Pregnancy Childbirth 2014; 14: 213.
- 44Villalbí J. R., Salvador J., Cano-Serral G., Rodríguez-Sanz M. C., Borrell C. Maternal smoking, social class and outcomes of pregnancy. Paediatr Perinat Epidemiol 2007; 21: 441–447.
- 45Yunis K., Beydoun H., Nakad P., Khogali M., Shatila F., Tamim H. Patterns and predictors of tobacco smoking cessation: a hospital-based study of pregnant women in Lebanon. Int J Public Health 2007; 52: 223–232.
- 46Yu S. M., Park C. H., Schwalberg R. H. Factors associated with smoking cessation among U.S. pregnant women. Matern Child Health J 2002; 6: 89–97.
- 47Kahn R. S., Certain L., Whitaker R. C. A reexamination of smoking before, during, and after pregnancy. Am J Public Health 2002; 92: 1801–1808.
- 48Aaronson N. K., Ershoff D. H., Danaher B. G. Smoking cessation in pregnancy: a self-help approach. Addict Behav 1985; 10: 103–108.
- 49Amezcua-Prieto C., Espigares-Rodríguez E., Mozas-Moreno J., Bueno-Cavanillas A., Jiménez-Moleón J. J., Lardelli-Claret P. Smoking modification during pregnancy: incidence and associated factors. Clin Invest Gynecol Obstet 2008; 35: 194–201.
- 50Appleton P. L., Pharoah P. O. D. Partner smoking behaviour change is associated with women's smoking reduction and cessation during pregnancy. Br J Health Psychol 1998; 3: 361–374.
- 51Avery M., Stallings W. Tobacco Use Among Pregnant Women in North Carolina: Predictors of Smoking Cessation During Pregnancy. Results from PRAMS, 1997–2001. SCHS Studies 138. Raleigh, NC: North Carolina State Center for Health Statistics; 2003. Available at: www.schs.state.nc.us/schs/pdf/schs138.pdf (accessed 30 December 2017) (Archived at http://www.webcitation.org/6w64kVebf on 30 December 2017).
- 52Bailey B. A. Factors predicting pregnancy smoking in Southern Appalachia. Am J Health Behav 2006; 30: 413–421.
- 53Connor S. K., McIntyre L. The sociodemographic predictors of smoking cessation among pregnant women in Canada. Can J Public Health 1999; 90: 352–355.
- 54Castrucci B. C., Culhane J. F., Chung E. K., Bennett I., McCollum K. F. Smoking in pregnancy: patient and provider risk reduction behavior. J Public Health Manag Pract 2006; 12: 68–76.
- 55Eriksson K. M., Haug K., Salvesen K. A., Nesheim B. I., Nylander G., Rasmussen S. et al. Smoking habits among pregnant women in Norway 1994–95. Acta Obstet Gynecol Scand 1998; 77: 159–164.
- 56Giglia R. C., Binns C. W., Alfonso H. S. Which women stop smoking during pregnancy and the effect on breastfeeding duration. BMC Public Health 2006; 6: 195.
- 57Graham H., Hawkins S. S., Law C. Lifecourse influences on women's smoking before, during and after pregnancy. Soc Sci Med 2010; 70: 582–587.
- 58Kvalvik L. G., Skjaerven R., Haug K. Smoking during pregnancy from 1999 to 2004: a study from the Medical Birth Registry of Norway. Acta Obstet Gynecol Scand 2008; 87: 280–285.
- 59Lauria L., Lamberti A., Grandolfo M. Smoking behaviour before, during, and after pregnancy: the effect of breastfeeding. Sci World J 2012; 2012: 154910.
- 60Mohsin M., Bauman A. E. Socio-demographic factors associated with smoking and smoking cessation among 426,344 pregnant women in New South Wales, Australia. BMC Public Health 2005; 5: 138.
- 61Más R., Escribà V., Colomer C. Who quits smoking during pregnancy? Scand J Soc Med 1996; 24: 102–106.
- 62Mc Leod D., Pullon S., Cookson T. Factors that influence changes in smoking behaviour during pregnancy. NZ Med J 2003; 116: U415.
- 63Nafstad P., Botten G., Hagen J. Partner's smoking: a major determinant for changes in women's smoking behaviour during and after pregnancy. Public Health 1996; 110: 379–385.
- 64Olsen J. Predictors of smoking cessation in pregnancy. Scand J Soc Med 1993; 21: 197–202.
- 65Passmore E., McGuire R., Correll P., Bentley J. Demographic factors associated with smoking cessation during pregnancy in New South Wales, Australia, 2000–2011. BMC Public Health 2015; 15: 398.
- 66Severson H. H., Andrews J. A., Lichtenstein E., Wall M., Zoref L. Predictors of smoking during and after pregnancy: a survey of mothers of newborns. Prev Med 1995; 24: 23–28.
- 67Torrent M., Sunyer J., Cullinan P., Basagaña X., Harris J., García O. et al. Smoking cessation and associated factors during pregnancy. Gac Sanit 2004; 18: 184–189.
- 68Berlin I., Singleton E. G., Heishman S. J. A comparison of the Fagerström Test for Cigarette Dependence and Cigarette Dependence Scale in a treatment-seeking sample of pregnant smokers. Nicotine Tob Res 2016; 18: 477–483.
- 69Blalock J. A., Robinson J. D., Wetter D. W., Cinciripini P. M. Relationship of DSM-IV-based depressive disorders to smoking cessation and smoking reduction in pregnant smokers. Am J Addict 2006; 15: 268–277.
- 70El-Mohandes A. A., El-Khorazaty M. N., Kiely M., Gantz M. G. Smoking cessation and relapse among pregnant African-American smokers in Washington, DC. Matern Child Health J 2011; 15: S96–105.
- 71Ershoff D. H., Quinn V. P., Boyd N. R., Stern J., Gregory M., Wirtschafter D. The Kaiser Permanente prenatal smoking-cessation trial: when more isn't better, what is enough? Am J Prev Med 1999; 17: 161–168.
- 72Fish L. J., Peterson B. L., Namenek Brouwer R. J., Lyna P., Oncken C. A., Swamy G. K. et al. Adherence to nicotine replacement therapy among pregnant smokers. Nicotine Tob Res 2009; 11: 514–518.
- 73Higgins S. T., Heil S. H., Badger G. J., Skelly J. M., Solomon L. J., Bernstein I. M. Educational disadvantage and cigarette smoking during pregnancy. Drug Alcohol Depend 2009; 104: S100–5.
- 74Higgins S. T., Heil S. H., Dumeer A. M., Thomas C. S., Solomon L. J., Bernstein I. M. Smoking status in the initial weeks of quitting as a predictor of smoking-cessation outcomes in pregnant women. Drug Alcohol Depend 2006; 85: 138–141.
- 75Kurti A. N., Davis D. R., Skelly J. M., Redner R., Higgins S. T. Comparison of nicotine dependence indicators in predicting quitting among pregnant smokers. Exp Clin Psychopharmacol 2016; 24: 12–17.
- 76Ludman E. J., McBride C. M., Nelson J. C., Curry S. J., Grothaus L. C., Lando H. A. et al. Stress, depressive symptoms, and smoking cessation among pregnant women. Health Psychol 2000; 19: 21–27.
- 77Ma Y., Goins K. V., Pbert L., Ockene J. K. Predictors of smoking cessation in pregnancy and maintenance postpartum in low-income women. Matern Child Health J 2005; 9: 393–402.
- 78Riaz M., Lewis S., Coleman T., Aveyard P., West R., Naughton F. et al. Which measures of cigarette dependence are predictors of smoking cessation during pregnancy? Analysis of data from a randomized controlled trial. Addiction 2016; 111: 1656–1665.
- 79Linares Scott T. J., Heil S. H., Higgins S. T., Badger G. J., Bernstein I. M. Depressive symptoms predict smoking status among pregnant women. Addict Behav 2009; 34: 705–708.
- 80Vaz L. R., Leonardi-Bee J., Aveyard P., Cooper S., Grainge M., Coleman T. et al. Factors associated with smoking cessation in early and late pregnancy in the smoking, nicotine, and pregnancy trial: a trial of nicotine replacement therapy. Nicotine Tob Res 2014; 16: 381–389.
- 81Woodby L. L., Windsor R. A., Snyder S. W., Kohler C. L., Diclemente C. C. Predictors of smoking cessation during pregnancy. Addiction 1999; 94: 283–292.
- 82White T. J., Redner R., Skelly J. M., Higgins S. T. Examining educational attainment, prepregnancy smoking rate, and delay discounting as predictors of spontaneous quitting among pregnant smokers. Exp Clin Psychopharmacol 2014; 22: 384–391.
- 83 J. P. T. Higgins, S. Green, editors. Cochrane Handbook for Systematic Reviews of Interventions Version 5.1.0 [updated March 2011]. The Cochrane Collaboration, 2011. Available at www.handbook.cochrane.org (accessed 30 December 2017) (Archived at http://www.webcitation.org/6w64rXIbD on 30 December 2017).
- 84Coleman T., Chamberlain C., Davey M. A., Cooper S. E., Leonardi-Bee J. Pharmacological interventions for promoting smoking cessation during pregnancy. Cochrane Database Syst Rev 2015; Issue 12. Art. No.: CD010078. https://doi.org/10.1002/14651858.CD010078.pub2.
- 85Naughton F., Prevost A. T., Gilbert H., Sutton S. Randomized controlled trial evaluation of a tailored leaflet and SMS text message self-help intervention for pregnant smokers (MiQuit). Nicotine Tob Res 2012; 14: 569–577.
- 86Duckworth A. L., Chertok I. R. Review of perinatal partner-focused smoking cessation interventions. MCN Am J Matern Child Nurs 2012; 37: 174–181.
- 87Eades S. J., Sanson-Fisher R. W., Wenitong M., Panaretto K., D'Este C., Gilligan C. et al. An intensive smoking intervention for pregnant Aboriginal and Torres Strait Islander women: a randomised controlled trial. Med J Aust 2012; 197: 42–46.
- 88Pollak K. I., Lyna P., Bilheimer A. K., Gordon K. C., Peterson B. L., Gao X. et al. Efficacy of a couple-based randomized controlled trial to help Latino fathers quit smoking during pregnancy and postpartum: the Parejas trial. Cancer Epidemiol Biomarkers Prev 2015; 24: 379–385.
- 89Cinciripini P. M., Blalock J. A., Minnix J. A., Robinson J. D., Brown V. L., Lam C. et al. Effects of an intensive depression-focused intervention for smoking cessation in pregnancy. J Consult Clin Psychol 2010; 78: 44–54.
- 90Lowry R. J., Billett A., Buchanan C., Whiston S. Increasing breastfeeding and reducing smoking in pregnancy: a social marketing success improving life chances for children. Perspect Public Health 2009; 129: 277–280.
- 91Morgan H., Hoddinott P., Thomson G., Crossland N., Farrar S., Yi D. et al. Benefits of Incentives for Breastfeeding and Smoking cessation in pregnancy (BIBS): a mixed-methods study to inform trial design. Health Technol Assess 2015; 19: 1–522; vii–viii.
- 92Vangeli E., Stapleton J., Smit E. S., Borland R., West R. Predictors of attempts to stop smoking and their success in adult general population samples: a systematic review. Addiction 2011; 106: 2110–2121.
- 93Sanderson S., Tatt I. D., Higgins J. P. T. Tools for assessing quality and susceptibility to bias in observational studies in epidemiology: a systematic review and annotated bibliography. Int J Epidemiol 2007; 36: 666–676.
- 94Katikireddi S. V., Egan M., Petticrew M. How do systematic reviews incorporate risk of bias assessments into the synthesis of evidence? A methodological study. J Epidemiol Community Health 2015; 69: 189–195.
- 95Viswanathan M., Berkman N. D., Dryden D. M., Hartling L. Assessing risk of bias and confounding in observational studies of interventions or exposures: further development of the RTI item bank. Rockville, MD: Agency for Healthcare Research and Quality; 2013.
- 96Businelle M. S., Kendzor D. E., Reitzel L. R., Vidrine J. I., Castro Y., Mullen P. D. et al. Pathways linking socioeconomic status and postpartum smoking relapse. Ann Behav Med 2013; 45: 180–191.