Table 1 Participants characteristics by sex mean and (SD) or n (%)

Age (years)

114

8.6 (0.3)

8.63 (0.27)

8.62 (0.37)

.584^a

0.31 ^{D Cohen}

Hight (cm)

101

135.1 (6.1)

136.0 (6.2)

134.5.0 (6.1)

.320^a

0.24 ^{D Cohen}

Weight (kg)

101

32.1 ± 7.3

30.6 (5.7)

33.4 (8.3)

.065^b

0.39 ^Glass

BMI (kg/m²)

101

17.4 (2.9)

16.9 (2.4)

17.9 (3.3)

.058^b

0.42 ^Glass

MVPA (days/week)

101

3.3 (1.7)

3.5 (1.8)

3.2 (1.6)

.318^b

0.17 ^Glass

MVPA categories^d

101

MVPA = 7 days/week

8 (8%)

5 (10%)

3 (6%)

.444^c

0.08 ^Phi

MVPA < 7 days/week

93 (92%)

45 (90%)

48 (94%)

Screen time (hrs/day)^e

107

3.3 (1.6)

3.0 (1.2)

3.7 (1.9)

.193^b

0.58 ^Glass

Screen time (hrs/day)f

114

2.5 (1.7)

2.1 (1.4)

2.9 (1.8)

.008^b

0.57^Glass

Screen time (hrs/day)^g

114

2.0 (1.3)

1.8 (1.0)

2.1 (1.6)

.400^b

0.3 ^Glass

Screen time categories^h

107

 ≤ 2 h/day

23 (22%)

12 (23%)

11 (20%)

.775^c

0.28 ^Phi

 > 2 h/day

84 (78,5%)

41 (77%)

43 (80%)

Sleep time (hrs/night)ⁱ

106

9.0 (0.9)

9.0 (0.9)

8.9 (1.0)

.972^c

0.11 ^Glass

Sleep time categories^j

  < 9 h/day

39 (37%)

21 (40%)

18 (33%)

.452^c

0.07 ^Phi

  ≥ 9 h/day

67 (63%)

31 (60%)

36 (67%)

Selected academic skills

 Visual-spatial functions (pts)

106

4.9 (1.5)

5.1 (1.4)

4.7 (1.4)

.137^b

0.29 ^Glass

 Visual-spatial functions (sec)

106

82.2 (47.7)

90.2 (59.1)

74.6 (32.0)

.061^b

0.29 ^Glass

 Visual-auditory integration – colors (sec)

106

52.8 (14.0)

55.4 (17.6)

50.4 (8.9)

.313^b

0.28 ^Glass

 Visual-auditory integration –- drawings (sec)

106

46.1 (12.9)

46.8 (12.9)

45.3 (13.1)

.589^b

0.12 ^Glass

 Visual-auditory integration – drawings/letters (sec)

106

55.9 (18.3)

58.7 (20.8)

53.2 (15.3)

.145^b

0.26 ^Glass

 Auditory integration (sec)

111

147.8 (50.7)

152.2 (58.4)

143.6 (41.9)

.379^b

0.15 ^Glass

 Perceptual-motor integration (pts)

99

6.3 (5.6)

7.4 (7.6)

5.3 (2.0)

.013^b

0.28^Glass

 Auditory and linguistic functions (pts)

103

6.7 (2.5)

7.2 (2.5)

6.3 (2.3)

.034^b

0.33^Glass