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. Author manuscript; available in PMC: 2009 Nov 20.
Published in final edited form as: Dev Psychol. 2007 Nov;43(6):1531–1543. doi: 10.1037/0012-1649.43.6.1531

Table 3.

Unconditional Linear and Quadratic Models of Growth

Linear Linear and quadratic
Effect Coefficient SE Coefficient SE
Fixed effects
    Intercept 2.78*** .02 2.73*** .036
    Linear slope .09*** .005 .13*** .018
    Quadratic slope −.005* .002
Random effects
    Intercept .274*** .025 .192*** .03
    Linear slope .01*** .001 .016 .01
    Quadratic slope −.00 .00
    Level-1 error .158*** .003 .155*** .003
Model fit
    −2 log likelihood 11,810.70 11,757.80
    AIC 11,822.70 11,777.80
    BIC 11,853.90 11,839.90

Note. AIC = Akaike information criterion. BIC = Bayesian information criterion.

*

p < .05.

***

p < .001.