Table 3.

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

Parameter	Estimate (SE)	Z valuea	P value
Intercept	0.513 (0.192)	2.68	.004
Covariance (I,S)b	−0.006 (0.005)	−1.18	.24
Study day	0.000 (0.000)	2.20	.01
Residual (VCc)	0.556 (0.029)	19.19	<.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).