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The idea of Matthew effects in reading—the widening achievement gap between good and poor readers—has attracted considerable attention in education research in the past 25 years. Despite the popularity of the topic, however, empirical studies that have analyzed the core assumption of Matthew effects in reading have produced inconsistent results. This review summarizes the empirical findings on the development of early interindividual differences in reading. We did not find strong support for the general validity of a pattern of widening achievement differences or for a pattern of decreasing achievement differences in reading. The inclusion of moderating variables, however, allowed a clearer picture to be painted. Matthew effects were more likely to occur for measures of decoding efficiency, vocabulary, and composite reading scores when the achievement tests were not affected by deficits in measurement precision. Furthermore, moderators such as the applied analytic method or the orthographic consistency of the language were of less importance for the emergence of Matthew effects in reading. An additional meta-analysis of studies reporting correlations between a baseline level and a growth parameter yielded a small, negative mean correlation (r = −.214), which again was moderated by properties of the measures. Possible explanations for the reported findings are discussed.

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According to the Matthew effect model, interindividual differences in reading competence between poor and normal readers should become wider as students grow older. The second part of the model assumes that these differential pathways are mainly attributable to differential reading activities. The purpose of this study is to examine whether both assumptions can be verified in a sample of German elementary school students. Data from 1,124 students, participating in the BiKS longitudinal study with assessment starting in Grade 3 and two further points of measurement in Grade 4, were available for our analyses. Latent growth curve models showed a significant lower linear and quadratic trend on reading competence development for students with severe reading deficits in comparison with their better classmates. Further analysis indicates that differential reading behaviour seems to be a prominent factor in explaining these differential pathways whereas the students' general cognitive abilities seem to be of less importance.