The value of a dual-energy CT Iodine map radiomics model for the prediction of collagen fiber content in the ccRCC tumor microenvironment

Table 2 Relationship between patient age, maximum tumor diameter, and collagen fiber content

Effect	Model fitting conditions	Likelihood ratio test
Effect	-2 log likelihood of the simplified model	chi-square test	Degree of freedom	Significance
Intercept	6.945^a	.000	0
Age	54.938	47.993	29	.015
Maximum tumor diameter	69.986	63.041	41	.015

The chi-square statistic is the difference in -2 log likelihood between the final model and the simplified model. The simplified model is formed by omitting an effect from the final model. The original assumption is that all parameters of the effect are 0
^aSince omitting this effect does not increase the degrees of freedom, this simplified model is equivalent to the final model

ISSN: 1471-2342