Developmental trajectories of physical activity and television viewing during adolescence among girls: National Growth and Health Cohort Study

Table 2 Model search process for physical activity (PA) trajectories

Determining the number of PA trajectory groups
Number of groups			BIC			Smallest group %
2			−48,370			29.0
3			−48,182			6.1
4			−48,014			5.6
5			−47,948			3.0
			↓
The final number of PA trajectory groups was determined to be 4.
			↓
Determining the highest model function of the 4 PA trajectory groups
	1^st iteration		2^nd iteration		3^rd iteration		4^th iteration
Group	Highest function	P-value	Highest function	P-value	Highest function	P-value	Highest function	P-value
Group 1	Quadratic	<0.001	Quadratic	<0.001	Quadratic	<0.001	Quadratic	<0.001
Group 2	Quadratic	<0.001	Quadratic	<0.001	Quadratic	0.14	Linear	<0.001
Group 3	Quadratic	<0.001	Quadratic	0.27	Linear	0.43	Constant	<0.001
Group 4	Quadratic	0.72	Linear	<0.001	Linear	<0.001	Linear	<0.001

ISSN: 1471-2458