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Table 2.

Comparison between included and excluded participant characteristics

CharacteristicIncluded (N=1181)Excluded (N=693)Difference P valuesa
Age, mean (SD), years 12.0 (0.4) 12.0 (0.4) 0.47 
Sex, No. (%) female 578 (49) 341 (49) 0.95 
Socioeconomic position, mean (SD), z-score 0.24 (0.99) 0.06 (0.99) N=686 <0.001 
Pubertal status, No. (%) 0.73 
 Pre-pubertal 120 (10) 45 (8) 
 Early pubertal 297 (25) 148 (27) 
 Mid-pubertal 603 (51) 282 (51) 
 Late pubertal 155 (13) 74 (13) 
Post-pubertal 6 (<1) 3 (<1) 
Activity behaviors: arithmetic mean (SD), min/d 
 Sleep 566 (46) 566 (46) N=101 0.98 
 Sedentary time 554 (81) 542 (80) N=101 0.18 
 Light physical activity 251 (57) 258 (54) N=101 0.20 
 MVPA 62 (34) 65 (33) N=101 0.36 
Activity behaviors: compositional meanb, min/d 
 Sleep; Sedentary time; Light physical activity; MVPA 577; 560; 250; 53 577; 549; 257; 57 0.56 
Anthropometry (N=1175) 
 %Body fat, mean (SD) 21.5 (8.4) 22.2 (8.6) N=683 0.08 
 BMI, mean (SD), z-score 0.44 (1.15) 0.55 (1.15) N=696 0.05 
 Waist circumference, mean (SD), z-score 0.80 (1.07) 0.88 (1.11) N=692 0.10 
HRQL (N=1181)  
 PedsQL Physical Score, mean (SD) 84.3 (12.1) 84.4 (13.2) N=667 0.96 
 PedsQL Psychosocial Score, mean (SD) 77.17 (13.8) 76.6 (14.5) N=667 0.42 
 PedsQL Total Scale Score, mean (SD) 79.7 (12.2) 79.3 (12.8) N=666 0.51 
Academic (N=931) 
 NAPLAN numeracy, mean (SD) 580 (70) 563 (66) N=492 <0.001 
 NAPLAN writing, comprehension, spelling, grammar, mean (SD) 559 (61) 546 (61) N=511 <0.001 
 Overall academic achievement, mean (SD) 569 (61) 554 (59) N=489 <0.001 
CharacteristicIncluded (N=1181)Excluded (N=693)Difference P valuesa
Age, mean (SD), years 12.0 (0.4) 12.0 (0.4) 0.47 
Sex, No. (%) female 578 (49) 341 (49) 0.95 
Socioeconomic position, mean (SD), z-score 0.24 (0.99) 0.06 (0.99) N=686 <0.001 
Pubertal status, No. (%) 0.73 
 Pre-pubertal 120 (10) 45 (8) 
 Early pubertal 297 (25) 148 (27) 
 Mid-pubertal 603 (51) 282 (51) 
 Late pubertal 155 (13) 74 (13) 
Post-pubertal 6 (<1) 3 (<1) 
Activity behaviors: arithmetic mean (SD), min/d 
 Sleep 566 (46) 566 (46) N=101 0.98 
 Sedentary time 554 (81) 542 (80) N=101 0.18 
 Light physical activity 251 (57) 258 (54) N=101 0.20 
 MVPA 62 (34) 65 (33) N=101 0.36 
Activity behaviors: compositional meanb, min/d 
 Sleep; Sedentary time; Light physical activity; MVPA 577; 560; 250; 53 577; 549; 257; 57 0.56 
Anthropometry (N=1175) 
 %Body fat, mean (SD) 21.5 (8.4) 22.2 (8.6) N=683 0.08 
 BMI, mean (SD), z-score 0.44 (1.15) 0.55 (1.15) N=696 0.05 
 Waist circumference, mean (SD), z-score 0.80 (1.07) 0.88 (1.11) N=692 0.10 
HRQL (N=1181)  
 PedsQL Physical Score, mean (SD) 84.3 (12.1) 84.4 (13.2) N=667 0.96 
 PedsQL Psychosocial Score, mean (SD) 77.17 (13.8) 76.6 (14.5) N=667 0.42 
 PedsQL Total Scale Score, mean (SD) 79.7 (12.2) 79.3 (12.8) N=666 0.51 
Academic (N=931) 
 NAPLAN numeracy, mean (SD) 580 (70) 563 (66) N=492 <0.001 
 NAPLAN writing, comprehension, spelling, grammar, mean (SD) 559 (61) 546 (61) N=511 <0.001 
 Overall academic achievement, mean (SD) 569 (61) 554 (59) N=489 <0.001 

aDifference tested using t-tests for continuous variables, chi-squared for categorical variables and compositional MANOVA for compositional variables; bCompositional mean was calculated by finding the geometric mean of each activity and linearly adjusting these values to collectively sum to 1440 (min/day). MVPA = moderate-to-vigorous physical activity; HRQL = Health-related quality of life; PedsQL = Pediatric Quality of Life Inventory; NAPLAN = National Assessment Program – Literacy and Numeracy

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