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Fertil Steril. 2014 Jul;102(1):183-191.e2. doi: 10.1016/j.fertnstert.2014.03.018. Epub 2014 Apr 18.

Active and passive smoking and fecundability in Danish pregnancy planners.

Author information

1
Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts. Electronic address: radin@bu.edu.
2
Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts.
3
Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts; RTI Health Solutions, Research Triangle Park, North Carolina.
4
Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark.
5
Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts; Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark.
6
Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts; Slone Epidemiology Center, Boston University, Boston, Massachusetts.

Abstract

OBJECTIVE:

To investigate the extent to which fecundability is associated with active smoking, time since smoking cessation, and passive smoking.

DESIGN:

Prospective cohort study.

SETTING:

Denmark, 2007-2011.

PATIENT(S):

A total of 3,773 female pregnancy planners aged 18-40 years.

INTERVENTION(S):

None.

MAIN OUTCOME MEASURE(S):

Self-reported pregnancy. Fecundability ratios (FRs) and 95% confidence intervals (CIs) were estimated using a proportional probabilities model that adjusted for menstrual cycle at risk and potential confounders.

RESULT(S):

Among current smokers, smoking duration of ≥10 years was associated with reduced fecundability compared with never smokers (FR, 0.85, 95% CI 0.72-1.00). Former smokers who had smoked ≥10 pack-years had reduced fecundability regardless of when they quit smoking (1-1.9 years FR, 0.83, 95% CI 0.54-1.27; ≥2 years FR, 0.73, 95% CI 0.53-1.02). Among never smokers, the FRs were 1.04 (95% CI 0.89-1.21) for passive smoking in early life and 0.92 (95% CI 0.82-1.03) for passive smoking in adulthood.

CONCLUSION(S):

Among Danish pregnancy planners, cumulative exposure to active cigarette smoking was associated with delayed conception among current and former smokers. Time since smoking cessation and passive smoking were not appreciably associated with fecundability.

KEYWORDS:

Fecundability; cigarette smoking; cohort study; fertility; tobacco smoke pollution

PMID:
24746741
PMCID:
PMC4104516
DOI:
10.1016/j.fertnstert.2014.03.018
[Indexed for MEDLINE]
Free PMC Article

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