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Original Investigation
May 19, 2020

Associations Between Maternal Antenatal Corticosteroid Treatment and Mental and Behavioral Disorders in Children

Author Affiliations
  • 1Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Helsinki, Finland
  • 2Information Services Department, THL Finnish Institute for Health and Welfare, Helsinki
  • 3Research Centre for Child Psychiatry, University of Turku, Turku, Finland
  • 4Department of Neurobiology, Karolinska Institute, Stockholm, Sweden
  • 5Department of Public Health Solutions, THL Finnish Institute for Health and Welfare, Helsinki and Oulu
  • 6PEDEGO Research Unit, MRC Oulu, Oulu University Hospital, University of Oulu, Oulu, Finland
  • 7Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim
  • 8Children’s Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland
JAMA. 2020;323(19):1924-1933. doi:10.1001/jama.2020.3937
Key Points

Question  Is maternal antenatal corticosteroid treatment associated with mental and behavioral disorders in children?

Findings  In this population-based retrospective cohort study that included 670 097 children, exposure to maternal antenatal corticosteroid treatment, compared with nonexposure, was significantly associated with mental and behavioral disorders in children (hazard ratio, 1.33).

Meaning  These findings may help inform decisions about maternal antenatal corticosteroid treatment.

Abstract

Importance  Maternal antenatal corticosteroid treatment is standard care to accelerate fetal maturation when birth before 34 weeks is imminent. Recently, expansion of the indications beyond 34 gestational weeks has been debated. However, data about long-term outcomes remain limited, especially among infants who after treatment exposure are born at term.

Objective  To study if antenatal corticosteroid treatment is associated with mental and behavioral disorders in children born at term (≥37 weeks 0 days’ gestation) and preterm (<37 weeks 0 days’ gestation) and if unmeasured familial confounding explains these associations.

Design, Setting, and Participants  Population-based retrospective cohort study using nationwide registries of all singleton live births in Finland surviving until 1 year and a within-sibpair comparison among term siblings. Children were born between January 1, 2006, and December 31, 2017, and followed up until December 31, 2017.

Exposures  Maternal antenatal corticosteroid treatment.

Main Outcomes and Measures  Primary outcome was any childhood mental and behavioral disorder diagnosed in public specialized medical care settings.

Results  Of the 674 877 singleton children born in Finland during the study period, 670 097 were eligible for analysis. The median length of follow-up was 5.8 (interquartile-range, 3.1-8.7) years. Of the 14 868 (2.22%; 46.1% female) corticosteroid treatment–exposed children, 6730 (45.27%) were born at term and 8138 (54.74%) were born preterm; of the 655 229 (97.78%; 48.9% female) nonexposed children, 634 757 (96.88%) were born at term and 20 472 (3.12%) were born preterm. Among the 241 621 eligible term-born maternal sibpairs nested within this population, 4128 (1.71%) pairs were discordant for treatment exposure. Treatment exposure, compared with nonexposure, was significantly associated with higher risk of any mental and behavioral disorder in the entire cohort of children (12.01% vs 6.45%; absolute difference, 5.56% [95% CI, 5.04%-6.19%]; adjusted hazard ratio [HR], 1.33 [95% CI, 1.26-1.41]), in term-born children (8.89% vs 6.31%; absolute difference, 2.58% [95% CI, 1.92%-3.29%]; HR, 1.47 [95% CI, 1.36-1.69]), and when sibpairs discordant for treatment exposure were compared with sibpairs concordant for nonexposure (6.56% vs 4.17% for within-sibpair differences; absolute difference, 2.40% [95% CI, 1.67%-3.21%]; HR, 1.38 [95% CI, 1.21-1.58]). In preterm-born children, the cumulative incidence rate of any mental and behavioral disorder was also significantly higher for the treatment-exposed compared with the nonexposed children, but the HR was not significant (14.59% vs 10.71%; absolute difference, 3.38% [95% CI, 2.95%-4.87%]; HR, 1.00 [95% CI, 0.92-1.09]).

Conclusions and Relevance  In this population-based cohort study, exposure to maternal antenatal corticosteroid treatment was significantly associated with mental and behavioral disorders in children. These findings may help inform decisions about maternal antenatal corticosteroid treatment.

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