Beyond the Null Effect: Unmasking the True Impact of Teacher-Child Interaction Quality on Child Outcomes in Early Head Start

JoonHo Lee; Alison Hooper

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arXiv · 2601.23203

Beyond the Null Effect: Unmasking the True Impact of Teacher-Child Interaction Quality on Child Outcomes in Early Head Start

JoonHo Lee·Alison Hooper

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Abstract

In Early Head Start (EHS), teacher-child interactions are widely believed to shape infant-toddler outcomes, yet large-scale studies often find only modest or null associations. This study addresses four methodological sources of attenuation -- item-level measurement error, center-level confounding, teacher- and classroom-level covariate imbalance, and overlooked nonlinearities -- to clarify classroom process quality's true influence on child development. Using data from the 2018 wave of the Early Head Start Family and Child Experiences Survey (Baby FACES), we applied a three-level generalized additive latent and mixed model (GALAMM) to distinguish genuine classroom-level variability in process quality, as measured by the Classroom Assessment Scoring System (CLASS) and Quality of Caregiver-Child Interactions for Infants and Toddlers (QCIT), from item-level noise and center-level effects. We then estimated dose-response relationships with children's language and socioemotional outcomes, employing covariate balancing weights and generalized additive models. Results show that nearly half of each item's variance reflects classroom-level processes, with the remainder tied to measurement error or center-wide influences, masking true classroom effects. After correcting for these biases, domain-focused dose-response analyses reveal robust linear associations between cognitive/language supports and children's English communicative skills, while emotional-behavioral supports better predict social-emotional competence. Some domains display plateaus when pushed to extremes, underscoring potential nonlinearities. These findings challenge the "null effect" narrative, demonstrating that rigorous methodology can uncover the critical, domain-specific impacts of teacher-child interaction quality, offering clearer guidance for targeted professional development and policy in EHS.

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JoonHo Lee, Alison Hooper. 2026-01-30. Beyond the Null Effect: Unmasking the True Impact of Teacher-Child Interaction Quality on Child Outcomes in Early Head Start. https://arxiv.org/abs/2601.23203

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