Table 4.

Model fit statistics and dispersion of model residuals for the treatment sample (n=1098). Model fit criterion was derived from SAS software, version 9.3.

Method of change specified	QICa,b (GEEc model)	AICd,b (Mixed)	BICe,b (Mixed)	Total variance (PHQ-9 σ2)
Linear (normal scale)	52457.6	14059.8	14071.3	16.716
Proportional (gamma scale)	2020.5	4041.8	4053.3	24.122

^aQIC: quasilikelihood under the independence model criterion.

^bConfidence intervals based on the multiplicative longitudinal GEE model specified in the analytical plan.

^cGEE: generalized estimated equation.

^dAIC: Akaike information criterion.

^eBIC: Bayesian information criterion.