Table 2.

Model fit for eating disorder symptom levels trajectories

Model	# of trajectory groups	Order (0 = constant, 1 = linear, 2 = quadratic)	BIC
(A) Full sample
Step 1: identify the ideal number of trajectory groups
1	3	2 2 2	− 2748.6
2	4	2 2 2 2	− 2762.04
3	2	2 2	− 2734.8
4	1	2	− 2879
Step 2: identify the ideal shape for the trajectories
3	2	2 2	− 2734.8
5	2	1 2	− 2735.9
(B) Only girls
Step 1: identify the ideal number of trajectory groups
1	3	2, 2, 2	− 1595.21
2	2	2, 2	− 1579.29
3	1	2	− 1661.45
Step 2: identify the ideal shape for the trajectories
2	2	2, 2	− 1579.29
4	2	1, 2	− 1582.03
5	2	2, 1	− 1634.24
(C) Only boys
Step 1: identify the ideal number of trajectory groups
1	3	2, 2, 2	− 1109.16
2	2	2, 2	− 1093.35
3	1	2	− 1118.05
Step 2: identify the ideal shape for the trajectories
2	2	2, 2	− 1096.62
4	2	1, 2	− 1093.35
5	2	0, 2	− 1103.28
6	2	1, 1	− 1115.36

Selected models are displayed in bold

BIC Bayesian Information Criterion