Telephone versus in-person administration of the Early Childhood Development Index 2030: a crossover study, Brazil, Canada, India and Malawi.

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.