Application of Zero-Inflated Poisson Mixed Models in Prognostic Factors of Hepatitis C

Table 5

The comparison of mixed ZIP and mixed PR.

Parameter	Category	Mixed ZIP model		Mixed PR model
		Estimated	Standard error	Estimated	Standard error
Intercept		3.6517	0.1659	0.7320	0.188
Age		0.0046	0.0023	0.0049	0.0036
Sex	Female*
	Male	−0.978	0.0833	−0.0487	0.0864
Risk factor	No
	Yes	0.4626	0.074	0.154	0.0803
Genotype	1*
	2	−0.8006	0.2381	−0.1760	0.2785
	3	−1.148	0.0932	−0.2357	0.0984
Treatment	Interferon plus Ribavirin*
	Peg-Interferon plus Ribavirin	−0.6628	0.0737	−0.2584	0.0728

∗Reference group.