Table 1.

The state of metastasis in lymph nodes

		Number	lymph nodes
		Number	Positive	Average positive number
IMPC		64	55(85.9%)^{^a}	13.25^{^c}
	≥25%	5	5 (100.0%) ^{^b}	8.8
IDC		57	30(52.6%)^{^a^b}	5.72^{^c}
tumor size<2.0cm
	IMPC	15	10 (66.7%) ^{^d}	10.4^{^e}
	IDC	14	4(28.6%) ^{^d}	4.8^{^e}

↵a χ²~16.0 P<0.0001
↵b χ² = 4.20 P<0.05
↵c t= 12.44 P<0.001
↵d χ²=4.06 P<0.05
↵e t=2.06 P<0.05