This may be related to the still immature evaluation of reading competencies in younger pupils but also to the fact that other factors not included in the PorTex test battery (such as personality traits, affectivity, social aspects, etc.) may play a role. This could also be a limitation of the study as a whole, i.e., that the tests and questionnaires in the PorTex battery do not fully explain all the connections with reading self-concept.
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