Despite its proven negative effects on fetal development, smoking during pregnancy remains a significant public health issue. During 2017, approximately 12.5% of all pregnant women in Finland smoked during pregnancy and 7% continued to smoke throughout their pregnancy.
Association between maternal smoking and offspring ADHD
Exposure to maternal smoking is associated with various adverse perinatal outcomes. An association between maternal smoking and offspring ADHD has been shown in several studies. However, the causality of the association has been questioned to be mostly due to familial confounding, says Docent Roshan Chudal from the Research Centre for Child Psychiatry at the University of Turku.
Previous studies on the topic underestimate the true rates of smoking
All previous studies on the topic were based on maternal self-report of smoking that has been shown to underestimate the true rates of smoking. The disclosure of smoking is even lower among pregnant smokers, continues Dr Chudal.
Maternal cotinine levels
Cotinine is the biomarker indicating nicotine exposure. This includes active smoking as well as nicotine exposure from other sources such as nicotine replacement therapy or passive smoking. Measuring cotinine levels from maternal serum specimens collected during pregnancy, this study investigated the association between nicotine exposure during pregnancy and offspring ADHD.
The study included 1,079 ADHD cases
This study included 1,079 ADHD cases and an equal number of matched controls born between 1998 and 1999. Maternal cotinine levels were measured from maternal serum specimens collected during the first and second trimesters of pregnancy and archived in the national biobank. The strength of the research is the availability of valuable information from the Finnish Maternity Cohort biobank (FMC).
First nationwide study using maternal cotinine levels
In this first nationwide study using maternal cotinine levels, we report a strong association between prenatal nicotine exposure and offspring ADHD, says Professor Andre Sourander, the leader of the research group from the Research Centre for Child Psychiatry.
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