Supplemental Material for
Class Composition Effects in Achievement and Interest and the Role of the Learning Environment Revisited: A Conceptual Replication and Extension of Lavrijsen et al. (2022)
Myriel Kopatz 
, Wolfgang Wagner, Claudia Neuendorf, Ulrich Trautwein, Benjamin Nagengast, and Lisa Bardach Journal of Educational Psychology,
Online First Publication,
October 5, 2026
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