Table 4.

Analysis of the Achievement Trajectories for Change-in-Cooperative Participation Groups: Results for Unconditional and Conditional Growth Models

Unconditional Model	Coefficient	SE	t
Model for initial status
Mean initial status	23.50	.20	117.27***
Model for linear change
Mean change rate	2.74	.03	79.87***
Level 1 Variances
Initial status	10.51	.93	11.36***
Change rate	.15	.02	6.65***
Conditional Growth Model	Coefficient	SE	t
Model for initial status
Increasingly Cooperative Participators	17.58	1.59	11.03***
Difference for Decreasingly Cooperative Participators	−.53	.45	−1.20
Model for linear change
Increasingly Cooperative Participators	2.59	.27	9.76***
Difference for Decreasingly Cooperative Participators	−.15	.07	− 1.98*

Note:

^*p< .05;

^**p< .01;

^***p< .001