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The problem
Intervention: No intervention was tested; this is an observational longitudinal study examining associations between early childhood conditions and later executive function development.
Who it was tested with: 1,295 children from six cohorts in the Environmental influences on Child Health Outcomes (ECHO) program, measured from before age 6 years through ages 6-15 years (mean age 9.95 years)..
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"Indicators of socioeconomic status, birth outcomes, parental characteristics, and pre- and post-natal exposures to alcohol and tobacco were measured before age 6 years. EF skills and language were measured from ages 6-15 years (M = 9.95, SD = 1.92), using measures from the NIH Toolbox." This is a longitudinal observational design tracking children over time without random assignment to conditions or manipulation of exposures, making it experimental in tier but inconclusive in direction since no intervention was tested—only associations between existing early conditions and later outcomes were examined.
This is an observational study that cannot establish causation. The study examined associations but did not manipulate any intervention or early conditions. Generalizability may be limited to the populations represented in the six ECHO cohorts.
Across countries and designs
21 studies · 29 countries
