Students (1) Sex (Biology) (1) Psychology (1) Measurement (1) Materials (1) Factor analysis (1) Elementary schools (1) Cities and towns (1) Academic achievement (1) Rendimiento académico (1) Análisis factorial (1) Escuelas primarias (1) Peruanos (1) Estudio (1) Estudiantes (1) Ciudades (1) Sexo (1) Medición (1) Materiales (1) Psicología (1) régression (1)