highly significantp ≤ 0.001
Differences among SE profiles The results of the Kruskal-Wallis ANOVA between the clusters according to levels of SE showed that there were highly significant differences ( p ≤ 0.001) in all the variables studied (family, teachers and peer support, as well as in academic performance in mathematics and language), although with different effect sizes: family support factor [χ 2 (2) = 155.8, p < 0.001, η 2 = 0.296]; teacher’s support factor [χ 2 (2) = 228.5, p < 0.001, η 2 = 0.434]; peers [χ 2 (2) = 98.8, p < 0.001, η 2 = 0.188]; academic performance in language [χ 2 (2) = 53.2, p < 0.001, η 2 = 0.101]; and in mathematics [χ 2 (2) = 48.1, p < 0.001, η 2 = 0.091].