Table 1.

Nemenyi post-hoc tests for academic performance and mathematical self-concept (α = .05). Own elaboration.

Item	Scale	Mean academic performance	Median academic performance
I think I am capable and skillful at mathematics	1	3.24 a	3.23 a
	2	3.47 a	3.35 a
	3	3.75 a	3.80 a
	4	4.09 b	4.24 b
	5	4.15 c	4.50 c
Being a good mathematics student makes me feel that my classmates and teachers think more of me	1	3.91 d	4.00 d
	2	3.79 de	3.90 de
	3	3.82 df	3.90 df
	4	3.94 dg	4.10 g
	5	4.03 g	4.30 g
In the mathematics exams I feel unsure, desperate, and nervous	1	4.08 h	4.50 h
	2	4.03 hi	4.20 hi
	3	3.86 j	3.90 j
	4	3.85 ik	3.90 ik
	5	3.59 l	3.60 l

Note: different letters represent significant differences.