Cross-sectional and longitudinal associations of domain-specific physical activity composition with health-related quality of life in childhood and adolescence in Australia

Table 1 Characteristics of participants included in at least one analytic sample and the total sample

	Included in ≥ 1 analytic sample (n = 3120)	All participants at 10-11y (n = 3764) ^a
Males, n (%)	1592 (51.0%)	1929 (51.2%)
Age in months, mean (SD)	130.5 (4.0) ^b	130.6 (4.0)
Socioeconomic position, z-scored, mean (SD)	0.0 (1.0) ^b	0.0 (1.0)
BMI, z-score	0.3 (1.2)	0.3 (1.2)
Pubertal development score ^c	1.7 (0.5)	1.7 (0.5)
Attended school on day of TUD, n (%)	1602 (51.3%) ^b	1683 (48.7%)
Season of measurement, n (%)
Summer	61 (2.0%)	72 (2.1%)
Autumn	774 (24.8%)	848 (24.5%)
Winter	1227 (39.3%)	1380 (39.8%)
Spring	1058 (33.9%)	1166 (33.6%)
PA domain participation at 10-11y (min/day)
Non-organized PA, mean (SD)	67.2 (81.4)	66.9 (81.4)
Organized PA, mean (SD)	27.5 (55.5)	27.2 (55.0)
Active transport, mean (SD)	9.7 (27.2)	9.9 (27.8)
Active chores/work, mean (SD)	15.4 (38.7)	15.6 (39.4)
HRQOL outcomes at 10-11y (PedsQL™ scores)
Physical functioning, mean (SD)	84.3 (14.8)	83.9 (15.4)
Psychosocial functioning, mean (SD)	77.4 (14.9)	76.9 (15.4)
Total functioning, mean (SD)	80.5 (13.1)	80.0 (13.6)
HRQOL outcomes at 12-13y (PedsQL™ scores)
Physical functioning, mean (SD)	84.1 (15.2)	83.9 (15.5)
Psychosocial functioning, mean (SD)	78.9 (14.7)	78.8 (14.8)
Total functioning, mean (SD)	81.2 (13.2)	81.1 (13.4)

HRQOL health-related quality of life, n number of participants, PA physical activity, PedsQL™ Pediatric Quality of Life Inventory, % proportion of sample, SD standard deviation, TUD time use diary. Percentages may add to more than 100% due to rounding
^a Variable-specific missing data for all participants at 10-11y: socioeconomic position (n = 57), BMI z-score (n = 192), pubertal development score (n = 57), school attendance on day of TUD (n = 309), season of measurement (n = 298), PA domain participation (n = 525; one additional value was missing for active transport due to an implausibly large value that was removed), PedsQL™ scores at 10-11y (n = 111). PedsQL™ scores at 12-13y (n = 965)
^b Participants with available covariate data who were excluded from all models were slightly older (131.1 months, p = 0.001, n = 644), of lower socioeconomic position (-0.2, p < 0.001, n = 587) and were less likely to have completed the TUD on a school day (24.2%, p < 0.001, n = 335), compared with those included in at least one model (n = 3120)
^c The pubertal development scale ranged from 1 (least developed) to 4 (most developed)

ISSN: 1479-5868