Maternal and grandmaternal smoking patterns are associated with early childhood asthma - PubMed (original) (raw)
Maternal and grandmaternal smoking patterns are associated with early childhood asthma
Yu-Fen Li et al. Chest. 2005 Apr.
Abstract
Objective: To investigate the associations of maternal and grandmaternal smoking before, during, and after pregnancy with childhood asthma.
Design, setting, and participants: We conducted a case-control study nested within the Children's Health Study in southern California. The case patients consisted of 338 children with asthma that had been diagnosed in the first 5 years of life, and 570 control subjects were countermatched on in utero exposure to maternal smoking within grade, sex, and community of residence.
Measurements: Detailed maternal and household smoking histories and other asthma risk factor information was obtained by telephone interview.
Results: The participation rates were 72.3% and 82.5%, respectively, for control subjects and case patients. In utero exposure to maternal smoking was associated with increased risk for asthma diagnosed in the first 5 years of life (odds ratio [OR], 1.5; 95% confidence interval [CI], 1.0 to 2.3), and for persistent asthma (OR, 1.5; 95% CI, 1.0 to 2.3). The associations did not differ in children with early transient asthma compared to those with early persistent asthma. Relative to never-smokers, children whose mothers smoked throughout the pregnancy had an elevated risk of asthma in the first 5 years of life (OR, 1.6; 95% CI, 1.0 to 2.6). Children of mothers who quit smoking prior to the pregnancy showed no increased risk (OR, 0.9; 95% CI, 0.5 to 1.5). We were unable to assess the association of smoking cessation during pregnancy because very few mothers were reported to have done so (15%). Asthma risk did not increase in a monotonic pattern with smoking intensity during pregnancy. Postnatal secondhand smoke exposure was not independently associated with asthma. Grandmaternal smoking during the mother's fetal period was associated with increased asthma risk in her grandchildren (OR, 2.1; 95% CI, 1.4 to 3.2).
Conclusions: Maternal and grandmaternal smoking during pregnancy may increase the risk of childhood asthma.
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