Cohort Profile: The Early Childhood Longitudinal Survey (ELPI), Chile

• The Early Childhood Longitudinal Survey (Encuesta Longitudinal de Primera Infancia, ELPI) was established to provide the
  first nationally representative longitudinal evidence on early childhood development in Chile and to document how social,
  familial, and policy contexts shape developmental inequalities from early life into adolescence.
• ELPI is based in Chile and began baseline data collection in 2010. The baseline cohort included 15 175 children born between January 2006 and August 2009, selected using a stratified, two-stage cluster design to ensure national representativeness
  across urban and rural areas. Children were aged 0–4 years at baseline and represented diverse socioeconomic and
  geographic backgrounds.
• Participants were followed up in 2012, 2017, and 2024. Attrition reached 34.1% by 2024, leaving approximately two-thirds of the original 2010 cohort currently under follow-up.
• The study collects extensive data on cognitive, socio-emotional, and physical development; family structure and home environment; parenting practices; caregiver mental health; socioeconomic conditions; childcare and education; and health behaviors.
• ELPI data are publicly available through Chile’s Banco Integrado de Datos. Researchers can access de-identified datasets and documentation following standard application procedures, enabling national and international collaboration.

Pablo Martínez, Vania Martínez, Gabriel Sotomayor López, Vicky Rojas, Jenny Encina, Matías Cociña, Massimiliano Orri, Cohort Profile: The Early Childhood Longitudinal Survey (ELPI), Chile, International Journal of Epidemiology, Volume 55, Issue 4, August 2026, dyag105, https://doi.org/10.1093/ije/dyag105