Multiple developmental disabilities among American children: prevalence and secular trends 2016-2022.

Objectives: We aimed to estimate the prevalence of multiple developmental disabilities, identify associated characteristics, and examine trends among American children from 2016 to 2022.
Study Design: This was a cross-sectional study.
Methods: Using the National Survey of Children's Health data from 2016 to 2022, we estimated the prevalence of multiple developmental disabilities among children aged 3-17 years. Multiple developmental disabilities were defined as two or more concurrent disabilities from 12 common disabilities. Trends were investigated using log-linear regression. Multivariate log-binominal regression was used to compare the prevalence prior to the COVID-19 pandemic (2016-2019) with prevalence during the COVID-19 pandemic (2020-2022).
Results: From 239,534 eligible children (mean age = 10.1 years; male = 51.7%), we found the overall prevalence of multiple developmental disabilities was 10.6%. The most predominant phenotype was attention-deficit/hyperactivity disorder concurrent with behavioural problems (2.1%). Higher prevalence was found among boys, non-Hispanic black children, those from low-household-income families and from families with lower education levels. Prevalence of multiple developmental disabilities increased from 9.8% in 2016 to 11.5% in 2022 (P = 0.014) with significantly higher prevalence during COVID-19 pandemic than before (11.2% vs 10.1%). These increases were found consistently across most sociodemographic groups.
Conclusions: Children from certain socio-disadvantaged groups were disproportionally affected by multiple developmental disabilities, highlighting the need for targeted strategies to improve health. The increasing prevalence during the pandemic suggests the need for ongoing monitoring of the trend and the impact of these conditions.
(Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)