Correlation of tumor-associated macrophage density and proportion of M2 subtypes with the pathological stage of colorectal cancer

Table 3 Logistic regression analysis: Comparison of model 1 and model 2

Model	Observed			Predicted
	Without independent predictors			Stage type		Percentage correct
				Early	Late
Model 1 (TAM density + M2 proportion)	Step 0	Stage type: Early or late	Early	0	17	0
			Late	0	26	100
		Overall percentage				60.5
	Step 1	Stage type: Early or late	Early	6	11	35.31
			Late	6	20	76.92
		Overall percentage				60.53
Model 2 (TAM density + M2 proportion + tumor grade + lymphovascular invasion)	Step 0	Stage type: Early or late	Early	0	17	0
			Late	0	26	100
		Overall percentage				60.5
	Step 1	Stage type: Early or late	Early	13	4	76.51
			Late	4	22	84.62
		Overall percentage				81.43

¹Represents specificity;

²Represents sensitivity;

³Represents overall predictability.

Constant is included in the model. The cutoff value is 500. TAMs: Tumor-associated macrophages.