biostudies-literatureUnknown31(1)Ochi M<h4>Background</h4>The Adachi Child Health Impact of Living Difficulty (A-CHILD) study has been conducted since 2015 to clarify the associations between socioeconomic factors and child health, as well as to accumulate data for political evaluation of the child-poverty agenda. This paper describes the purpose and research design of the A-CHILD study and the baseline profiles of participants, together with the future framework for implementing this cohort study.<h4>Methods</h4>We have conducted two types of continuous survey: a complete-sample survey started in 2015 as a first wave study to target first-grade children in all public elementary schools in Adachi City, Tokyo, and a biennial fixed grade observation survey started in 2016 in selected elementary and junior high schools. QuestionnaJournal of epidemiology77-89https://www.ebi.ac.uk/biostudies/studies/S-EPMC7738641biostudies-literatureAdachi Child Health Impact of Living Difficulty (A-CHILD) Study: Research Protocol and Profiles of Participants.PMC7738641Ochi MIsumi ADoi SFujiwara TKato TfalseAdachi Child Health Impact of Living Difficulty (A-CHILD) Study: Research Protocol and Profiles of Participants.<h4>Background</h4>The Adachi Child Health Impact of Living Difficulty (A-CHILD) study has been conducted since 2015 to clarify the associations between socioeconomic factors and child health, as well as to accumulate data for political evaluation of the child-poverty agenda. This paper describes the purpose and research design of the A-CHILD study and the baseline profiles of participants, together with the future framework for implementing this cohort study.<h4>Methods</h4>We have conducted two types of continuous survey: a complete-sample survey started in 2015 as a first wave study to target first-grade children in all public elementary schools in Adachi City, Tokyo, and a biennial fixed grade observation survey started in 2016 in selected elementary and junior high schools. Questionna2021-01-01T00:00:00Z2021 Jan2025-04-22T09:24:43.91Z2021-02-20T18:00:16ZS-EPMC77386413220140110.2188/jea.JE20190177