‘Social screens’ and ‘the mainstream’: longitudinal competitors of non-organized physical activity in the transition from childhood to adolescence

Table 2 Characteristics of the analytic and full samples at Wave 4, LSAC data^a

Variable [wave of measurement]	Analytic sample (n = 1043)^b	Full sample (n = 4169)^c
Males, n (%) [w1]	538 (51.6%)	1594 (51.0%)
Age of child, mean (SD) [w4]	10.9 (0.3)	10.9 (0.3)
Family socioeconomic position index, mean (SD) [w4] ^d	0.0 (1.0)	0.0 (1.0)
Child attends public school, n (%) [w4]	642 (62.0%)	2008 (64.6%)
Speaks a language other than English at home, n (%) [w4]	84 (8.2%)	251 (8.2%)
Aboriginal or Torres Strait Islander, n (%) [w1]	23 (2.2%)	95 (3.0%)
Single-parent family, n (%) [w4]	148 (14.2%)	504 (16.1%)
Lives in regional or remote area, n (%) [w4]	472 (15.2%)	149 (14.3%)
Attended school on day of TUD, n (%) [w4]	641 (61.5%)***	1457 (49.4%)***
Season of measurement, n (%) [w4]
Summer	5 (0.5%)	17 (0.5%)
Autumn	269 (25.8%)	814 (26.0%)
Winter	548 (52.5%)	1564 (50.0%)
Spring	221 (21.2%)	731 (23.4%)

n number of participants, w wave, % proportion of sample, SD standard deviation
Bold text indicates statistically significant differences: ***p < 0.001
a.The analytic sample was selected due to having a decline in non-organized PA participation between 11 and 13 years and a consistent ‘type of day’ in the TUD in both waves.
b.Variable-specific missing data for analytic sample: socioeconomic position (n = 10), school type (n = 8), language spoken at home (n = 22), number of parents in home (n = 2), remoteness (n = 2).
c.Variable-specific missing data for full sample: socioeconomic position (n = 25), school type (n = 19), language spoken at home (n = 83), Aboriginal or Torres Strait Islander status (n = 2), number of parents in home (n = 3), remoteness (n = 18), TUD day type (n = 175).
d.The socioeconomic position index was z-scored and ranged from − 5.4 to 2.9 in the overall sample.

ISSN: 1479-5868