title: Patterns of Smoking Behaviour in Low-Income Pregnant Women: A Cohort Study of Differential Effects on Infant Birth Weight.
abstract: Maternal smoking accounts for 20%-30% of low birth weight (BW). Second-Hand Smoke (SHS) also negatively affects BW. This cohort study explored the differential effect of smoking patterns during pregnancy on infant BW. Smoking status for 652 self-reported smokers attending public ante-natal clinics was assessed at baseline (V1 first ante-natal visit), 28-32 weeks (V2) and one week after birth (V3). Multivariable generalised linear regression models tested smoking patterns (continuing to smoke, sustained quitting, partial quitting) on BW adjusting for household smoking and other co-variates. Total quitting showed a median increase of 288 g in BW (95% CI (confidence intervals): 153.1-423 g,p< 0.001), compared to partial quitting (147 g, (95% CI: 50-244 g),p< 0.003). In partial quitters, increased BW was observed only in females 218 g, (95% CI: 81-355 g),p= 0.002). Household SHS showed a specific negative influence on pre-term but not term BW. This study suggests that, for low-income women, quitting or partial quitting during pregnancy both have a positive influence on infant BW. Whether others in the household smoke is also important.
authors: Discipline of Public Health and Primary Care, Trinity College Dublin, Dublin 2, Ireland. hayesc9@tcd.ie.
authors: Catherine
authors: C
authors: Hayes
authors: Department of Obstetrics and Gynaecology, The Rotunda Hospital, Dublin 1, Ireland. morgankearney@gmail.com.
authors: Morgan
authors: M
authors: Kearney
authors: Department of Obstetrics and Gynaecology, The Rotunda Hospital, Dublin 1, Ireland. antenatalmidwife@yahoo.ie.
authors: Helen
authors: H
authors: O'Carroll
authors: Discipline of Public Health and Primary Care, Trinity College Dublin, Dublin 2, Ireland. ZGAGAL@tcd.ie.
authors: Lina
authors: L
authors: Zgaga
authors: Department of Obstetrics and Gynaecology, The Rotunda Hospital, Dublin 1, Ireland. mppgeary@gmail.com.
authors: Michael
authors: M
authors: Geary
authors: School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin 4, Ireland. cecily.kelleher@ucd.ie.
authors: Cecily
authors: C
authors: Kelleher
mesh_terms: D000293:Adolescent; D000328:Adult; D016902:Air Pollution, Indoor / Q000009:adverse effects; D001724:Birth Weight / Q000187:drug effects*; D015331:Cohort Studies; D005260:Female; D040261:Harm Reduction; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007494:Ireland / Q000453:epidemiology; D008297:Male; D018811:Maternal Exposure / Q000009:adverse effects*; D011203:Poverty / Q000523:psychology*; D011247:Pregnancy; D037841:Pregnant People / Q000523:psychology*; D057566:Self Report; D012907:Smoking / Q000009:adverse effects* / Q000453:epidemiology; D016540:Smoking Cessation; D014028:Tobacco Smoke Pollution / Q000009:adverse effects* / Q000706:statistics & numerical data; D055815:Young Adult
chemical_list: D014028:Tobacco Smoke Pollution
keywords: gender; harm reduction; inequalities; smoking cessation; tobacco control