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Low Apgar scores and risk of childhood attention deficit hyperactivity disorder
Jiong Li1, Jørn Olsen, Mogens Vestergaard
1Department of Epidemiology, School of Public Health, University of Aarhus, Aarhus, Denmark. jl@soci.au.dk
Insights
Low Apgar scores at birth are linked to a higher risk of attention deficit hyperactivity disorder (ADHD) in children. This association suggests potential shared causes or that low Apgar scores may indicate pathways leading to ADHD.
Area of Science:
- Neonatal Health
- Child Psychology
- Epidemiology
Background:
- Apgar scores assess a newborn's physical condition.
- Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder.
- The relationship between Apgar scores and ADHD risk requires further investigation.
Purpose of the Study:
- To determine if low Apgar scores at 5 minutes post-birth correlate with an increased risk of developing ADHD.
- To analyze the dose-response relationship between Apgar scores and ADHD incidence.
Main Methods:
- Nationwide population-based cohort study in Denmark (1988-2001).
- Inclusion of 980,902 singletons.
- Follow-up from age 3 until ADHD diagnosis, medication, migration, death, or end of 2006.
- Cox regression models used to assess the association between Apgar scores and ADHD.
Main Results:
- An inverse association was observed between Apgar scores and ADHD risk.
- Children with Apgar scores of 1-4 had a 75% higher risk of ADHD compared to those with scores of 9-10.
- Children with Apgar scores of 5-6 had a 63% higher risk of ADHD.
Conclusions:
- Low Apgar scores at 5 minutes are significantly associated with an increased risk of childhood ADHD.
- The findings suggest potential shared underlying causes for low Apgar scores and ADHD.
- Low Apgar scores may represent a marker for causal pathways contributing to ADHD development.
Objective:
To examine whether low Apgar scores at 5 minutes are associated with increased risks of attention deficit hyperactivity disorder (ADHD).
Study Design:
We conducted a nationwide population-based cohort study of all 980 902 singletons born in Denmark from 1988 to 2001. All children were monitored from 3 years of age until a first International Classification of Diseases diagnosis of hyperkinetic disorder, a first medication for ADHD, migration, death, or the end of 2006, whichever came first. We used Cox regression models to examine the association between Apgar scores at 5 minutes and ADHD.
Results:
Apgar scores were inversely associated with risk of ADHD (hazard ratio 0.92; 95% CI: 0.88-0.96, P trend < .001). Compared with children with Apgar scores of 9 or 10 at 5 minutes, the risk for ADHD was 75% higher in children with Apgar scores of 1 to 4 (hazard ratio 1.75; 95% CI: 1.15 to 2.11) and 63% higher for those with Apgar scores of 5 to 6 (95% CI: 1.25 to 2.11).
Conclusions:
A low Apgar score was associated with an increased risk of ADHD in childhood. Low Apgar scores and ADHD may share common causes or a low Apgar score reflects at least one causal pathway leading to ADHD.
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