COVID-19 school closures caused approximately 70% attrition on the primary outcome, limiting the trial's power to detect effects¶
Claim · All claims
Evidence · 1 study · causalr2·q3
Currency · newest study 2026 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
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q3 i? Postintervention data collection faced approximately 70% attrition on the primary outcome, yielding a final analytical sample of n = 753 and reduced statistical power. → O'Reilly 2026
Evidence¶
O'Reilly 2026¶
O'Reilly, F., Loeb, S., Farrell, A., & Scerif, G. (2026). Supporting Parents to Support Children: A U.K. Randomized Controlled Trial Testing a Text Message Intervention to Cultivate the Home Learning Environment. Journal of Educational Psychology. https://doi.org/10.1037/edu0000973
q3 · i? · causal · r2
Attrition analysis in the RCT: nationwide school closures in early 2021 prevented postintervention YARC collection for most of the randomized sample. The authors report missingness checks (logistic regressions on school and pupil characteristics, balance across arms) and state the retained sample was comparable to the original U.S. study.
"Due to COVID-19, postintervention data collection faced approximately 70% attrition on the primary outcome measure, resulting in a final analytical sample of n = 753."
Discussion¶
Related Claims¶
- Systematic attrition differences mean COVID-19 impacts on student achievement are likely underestimated in fall 2020 MAP Growth results — related
- Educators and evaluators faced open questions about how to measure student performance after COVID disruptions — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
covid-attrition-limited-power |
title |
COVID-19 school closures caused approximately 70% attrition on the primary outcome, limiting the trial's power to detect effects |
description |
COVID-19 school closures caused approximately 70% attrition on the primary outcome, limiting the trial's power to detect effects |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2026 |
generated |
by process:wiki-ingest on 2026-10-24 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — oreilly-2026 |
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