A protocol-guided systematic review and meta-analysis examined how components of early childhood education and care (ECEC) quality relate to children’s language and mathematics competences in the first two grades of primary school. 17 peer-reviewed studies met inclusion criteria, and 11 provided effect sizes for quantitative synthesis. The review addressed two questions: (1) To what extent do process and structural quality show direct associations with academic competences in grades 1 and 2, and do component-specific differences emerge across teacher–child relationships, interaction quality, classroom organization, instructional support, and pre-academic activities. (2) Do these associations vary across sample type, continent, or study quality when individual study characteristics are considered.
A meta-analytic approach was used to estimate pooled correlations. ECEC quality was operationalized as process quality and structural quality. Process quality included student–teacher relationships rated with the Student–Teacher Relationship Scale and observed interaction quality with the Classroom Assessment Scoring System, as well as classroom organization, instructional support, and targeted pre-academic activities in language and mathematics. Structural quality included class size, child–teacher ratio, teacher qualification, and global environment ratings. Academic competences were assessed with standardized tests or teacher reports in language and mathematics during grades 1 and 2.
Findings showed a small positive pooled association between student–teacher relationships and interaction quality and later academic competences (k = 8, N = 9,896, Δ = .11, p < .001, 95% CI [.05, .18]). Heterogeneity was high (Q = 40.91, p < .001; I² = 77.70%). Subgroup contrasts by continent, sample type, and study quality were not statistically significant. Pre-academic activities and supports also showed a small positive pooled association (k = 4, N = 1,856, Δ = .07, p < .001, 95% CI [.02, .11]) with negligible heterogeneity (Q = 1.07, p > .05; I² = .01%). Structural quality showed a pooled association that was not statistically significant and was highly heterogeneous (k = 3, N = 17,804, Q = 44.96, p < .001; I² = 93.94%). Publication bias tests suggested no small-study effects for the process and pre-academic models, while funnel asymmetry and a significant Egger test indicated bias for the structural model. At the study level, results were mixed. Some analyses linked closeness in kindergarten to later reading and linked teacher certification specific to early childhood to higher grade-1 reading and mathematics, while many associations for class size and child–teacher ratio were null.
This evidence base offers practical guidance for improving early learning trajectories. It underscores the importance of strengthening teacher–child relationships, enriching interaction quality, and implementing purposeful pre-academic activities that support early literacy and foundational mathematics. Structural inputs remain important as enabling conditions, yet clearer and more consistent measurement is needed to establish their longer-term academic links. The findings support professional development that targets relational competencies, classroom organization, and instructional support, together with careful design and implementation of pre-academic practices to promote equitable and effective learning outcomes.
Source (Open Access): Rademacher, A., Bäker, N., von Düring, U., Hiltunen, V., & Goagoses, N. (2025). The effects of early childhood education and care quality on academic competences in early primary school: A systematic review and meta-analysis. European Journal of Psychology of Education, 40(4), 1-31.