Table 2 Model fit for eating disorder symptom levels trajectories

(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