Cohort Profile Update: 2015 Pelotas (Brazil) Birth Cohort Study－follow-ups from 2 to 6–7 years, with COVID-19 impact assessment
Joseph Murray, Otávio Amaral de Andrade Leão, Thaynã Ramos Flores, Flávio Fernando Demarco, Luciana Tovo‐Rodrigues, Isabel Oliveira, Adriane Xavier Arteche, Cauane Blumenberg, Andréa Dâmaso Bertoldi, Marlos Rodrigues Domingues, Mariângela Freitas da Silveira, Pedro Curi Hallal
Abstract
What is the reason for the new data collection?There were four main reasons to conduct new follow-ups at 2 years, 4 years, 5 years and 6-7 years: (i) to monitor lifecourse determinants of health as children moved into middle Key Features� The 2015 Pelotas Birth Cohort is a population-based study in Pelotas city, Brazil.It originally aimed to investigate life-course determinants of health and development, and investigate time trends comparing with earlier birth cohorts in the same city.The 4275 participants were assessed at birth and previously followed at ages 3 and 12 months.� Here we present details of new follow-ups at ages 2, 4 and 6-7 years, a COVID-19 impact study at age 5 years, and a nested randomized trial of two parenting programmes.� New areas of research include violence and psychosocial development, stress, sleep patterns and impacts of the COVID-19 pandemic.New biomarkers have been collected, including hair cortisol concentration and genetic data, and new detailed assessments of the caregiving environment and child development have been made in recent follow-ups.The nested PI � A trial evaluated effects of two group-based parent-training programmes on parenting and child development.� Follow-up rates were 95.4% (n ¼ 4014) at age 2 years, 95.4% (n ¼ 4010) at 4 years and 92.0%(n ¼ 3867) at 6-7 years.The web-based COVID-19 impact study included 2183 participants (56.6%).The PI � A trial of parenting programmes includes 369 mother-child dyads.