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Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study

OBJECTIVES: To study the changes in prevalence, characteristics and outcomes of pregnant smokers over time and legislative changes. DESIGN AND SETTING: Retrospective nationwide cohort. PARTICIPANTS: Our study consisted of 9627 randomly selected pregnancies from the Finnish Maternity Cohort (1987–201...

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Autores principales: Männistö, T, Bloigu, A, Heino, A, Gissler, M, Surcel, H M
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BMJ Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5168511/
https://www.ncbi.nlm.nih.gov/pubmed/27895067
http://dx.doi.org/10.1136/bmjopen-2016-013296
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author Männistö, T
Bloigu, A
Heino, A
Gissler, M
Surcel, H M
author_facet Männistö, T
Bloigu, A
Heino, A
Gissler, M
Surcel, H M
author_sort Männistö, T
collection PubMed
description OBJECTIVES: To study the changes in prevalence, characteristics and outcomes of pregnant smokers over time and legislative changes. DESIGN AND SETTING: Retrospective nationwide cohort. PARTICIPANTS: Our study consisted of 9627 randomly selected pregnancies from the Finnish Maternity Cohort (1987–2011), with demographic characteristics and pregnancy and perinatal data obtained from the Medical Birth Registry and early pregnancy serum samples analysed for cotinine levels. Women were categorised based on their self-reported smoking status and measured cotinine levels (with ≥4.73 ng/mL deemed high). Data were stratified to three time periods based on legislative changes in the Tobacco Act. PRIMARY AND SECONDARY OUTCOME MEASURES: Prevalence of pregnant smokers and demographics, and perinatal and pregnancy outcomes of pregnant smokers over time. RESULTS: Overall, 71.6% of women were non-smokers, 16.2% were active cigarette smokers, 7.7% undisclosed smoking but had high cotinine levels and 4.5% were inactive cigarette smokers. The prevalence of active cigarette smokers decreased from mid-1990s onwards among women aged ≥30 years, probably due to the ban of cigarette smoking in most workplaces. We observed no changes in the prevalence of inactive smokers or women who undisclosed smoking by time or legislative changes. Women who undisclosed smoking had similar characteristics and perinatal outcomes as inactive and active smokers. Compared with non-smokers, women who undisclosed smoking were more likely to be young, unmarried, have a socioeconomic status lower than white-collar worker and have a preterm birth. CONCLUSIONS: Women who undisclosed smoking were very similar to pregnant cigarette smokers. We observed a reduction in the prevalence of active pregnant cigarette smokers after the ban of indoor smoking in workplaces and restaurants, mostly among women aged ≥30 years.
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spelling pubmed-51685112016-12-22 Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study Männistö, T Bloigu, A Heino, A Gissler, M Surcel, H M BMJ Open Epidemiology OBJECTIVES: To study the changes in prevalence, characteristics and outcomes of pregnant smokers over time and legislative changes. DESIGN AND SETTING: Retrospective nationwide cohort. PARTICIPANTS: Our study consisted of 9627 randomly selected pregnancies from the Finnish Maternity Cohort (1987–2011), with demographic characteristics and pregnancy and perinatal data obtained from the Medical Birth Registry and early pregnancy serum samples analysed for cotinine levels. Women were categorised based on their self-reported smoking status and measured cotinine levels (with ≥4.73 ng/mL deemed high). Data were stratified to three time periods based on legislative changes in the Tobacco Act. PRIMARY AND SECONDARY OUTCOME MEASURES: Prevalence of pregnant smokers and demographics, and perinatal and pregnancy outcomes of pregnant smokers over time. RESULTS: Overall, 71.6% of women were non-smokers, 16.2% were active cigarette smokers, 7.7% undisclosed smoking but had high cotinine levels and 4.5% were inactive cigarette smokers. The prevalence of active cigarette smokers decreased from mid-1990s onwards among women aged ≥30 years, probably due to the ban of cigarette smoking in most workplaces. We observed no changes in the prevalence of inactive smokers or women who undisclosed smoking by time or legislative changes. Women who undisclosed smoking had similar characteristics and perinatal outcomes as inactive and active smokers. Compared with non-smokers, women who undisclosed smoking were more likely to be young, unmarried, have a socioeconomic status lower than white-collar worker and have a preterm birth. CONCLUSIONS: Women who undisclosed smoking were very similar to pregnant cigarette smokers. We observed a reduction in the prevalence of active pregnant cigarette smokers after the ban of indoor smoking in workplaces and restaurants, mostly among women aged ≥30 years. BMJ Publishing Group 2016-11-28 /pmc/articles/PMC5168511/ /pubmed/27895067 http://dx.doi.org/10.1136/bmjopen-2016-013296 Text en Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/ This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
spellingShingle Epidemiology
Männistö, T
Bloigu, A
Heino, A
Gissler, M
Surcel, H M
Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study
title Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study
title_full Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study
title_fullStr Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study
title_full_unstemmed Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study
title_short Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study
title_sort changes in objectively measured smoking in pregnancy by time and legislative changes in finland: a retrospective cohort study
topic Epidemiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5168511/
https://www.ncbi.nlm.nih.gov/pubmed/27895067
http://dx.doi.org/10.1136/bmjopen-2016-013296
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