Table 7.

Covariance parameters for the interactive effect of condition and time (study day) predicting daily self-reported depression.

Parameter	Estimate (SE)	Z valuea	P value
Intercept	0.566 (0.191)	2.97	.002
Covariance (I,S)b	−0.007 (0.005)	−1.49	.14
Study day	0.000 (0.000)	2.19	.01
Residual (VCc)	0.505 (0.027)	18.92	<.001

^aThe Z value represents the test value of the z distribution on which statistical significance is determined for this analysis.

^bCovariance between the random parameters for intercept and slope in the multilevel model.

^cVC: variance component (method for structuring the covariance matrix).