Nicholas Kuzik, Sabrina Buchanan, Sarita Bacciotti, Madison Boyd, Emily Bremer, Brianne A. Bruijns, Hilary At Caldwell, Claudia Cappa, Valerie Carson, Guy Faulkner, Alex Antônio Florindo, Anelise Reis Gaya, Kianoush Harandian, Uddhavi Kand, Janine Kayange, Himangi Lubree, Clarice Martins, Tawonga Mwase-Vuma, Anthony Okely, Linda S. Pagani, Nicole Petrowski, Morgan Potter, Evelyn Helena Corgosinho Ribeiro, Patricia Tucker, Roseanne Autran, Mark S Tremblay
Objective: To examine agreement between telephone and in-person administration of the Early Childhood Development Index 2030 (ECDI2030) survey. Methods: -tests and intraclass correlation coefficients. Findings: : -0.36), regardless of modality. However, pooled and stratified intraclass correlation coefficients analyses indicated that these modalities were statistically similar, with values ranging from 0.89 to 0.93, which are values commonly categorized as good to excellent. Conclusion: This multinational, multicentre, crossover study shows high agreement between telephone and in-person administration of the ECDI2030 across economically, culturally and geographically diverse settings. Expanding administration modalities may improve feasibility, particularly in geographically dispersed populations and rural settings.