Table 1 Participant characteristics

Baseline Characteristics

n (%)

120 (100)

82 (68)

38 (32)

Age (mean (SD))

10.0 (0.3)

10.0 (0.3)

10.1 (0.3)

Puberty Stage (n (%))

Pre-pubertal

78 (65)

43 (52)

35 (92)

Early pubertal

24 (20)

21 (26)

3 (8)

Mid-pubertal

18 (15)

18 (22)

0 (0)

Parental Education (n (%))

Low

8 (7)

7 (9)

1 (3)

Mid

43 (36)

28 (34)

15 (40)

High

69 (58)

47 (57)

22 (58)

Fatness/Fitness^a (mean (SD))

zBMI

0.17 (1.20)

0.10 (1.21)

0.33 (1.18)

VO₂max (mL/kg/min)

40.1 (6.6)

37.4 (4.1)

45.9 (7.1)

Academic Performance (mean (SD))

PAT scaled score

126 (9)ⁿ⁼¹⁰³

127 (9)ⁿ⁼⁶⁹

123 (9)ⁿ⁼³⁴

Device-Measured (Accelerometry)^b (arithmetic mean (SD)) (min/day)

Sleep

588 (52)

585 (56)

595 (41)

Sedentary

488 (98)

502 (92)

458 (105)

LPA

279 (70)

278 (70)

280 (70)

MVPA

85 (52)

75 (44)

106 (62)

Self-Reported (MARCA)^b (arithmetic mean (SD)) (min/day)

Sleep

625 (62)

619 (65)

637 (53)

Sedentary

501 (105)

500 (107)

503 (102)

LPA

196 (74)

202 (79)

182 (62)

MVPA

119 (64)

119 (67)

118 (58)

MARCA minus Accelerometry (mean (SD)) (min/day)

Difference in sleep

37 (59)

34 (65)

41 (44)

Difference in sedentary

12 (109)

-3 (106)

45 (109)

Difference in LPA

-83 (91)

-76 (91)

-98 (89)

Difference in MVPA

34 (68)

44 (71)

12 (58)