Table 1.

Descriptive statistics of cognitive abilities and academic success at primary, secondary, and high levels of school education.

Variable	Mean (Standard Deviation)
Fluid intelligence	37.99 (9.48) 45.62 (6.76) 51.42 (5.06)
Information processing speed	1.00 (0.32) 0.50 (0.20) 0.48 (0.20)
Visuospatial working memory	2.50 (1.86) 4.30 (1.85) 4.99 (1.80)
Number sense	95.48 (14.13) 104.20 (14.10) 109.60 (14.00)
Language	3.95 (0.60) 3.90 (0.60) 3.91 (0.68)
Math	4.06 (0.59) 3.80 (0.65) 3.94 (0.76)
Biology	4.48 (0.53) 3.97 (0.63) 4.04 (0.69)