Table 1.

Comparison of demographic features and tumor size between lymph node metastases positive versus negative pancreatic ductal adenocarcinoma (155 cases)

	Lymph node metastases positive(n = 72)	Lymph node metastases negative(n = 83)	Comparison between two groups	P value
Gender(male/female)	46/26	59/24	Chi-square = 0.614	0.433
Age(mean ± standard deviation), years	63.3 ± 9.5	64.2 ± 9.8	t = 0.613	0.541
Tumor size(Median[quartile 1, quartile 3]), cm	3.0(2.5, 4.0)	3.0(2.5, 4.0)	U = 2803	0.503

Abbreviation: n number of cases, t independent samples t test, U Mann-Whitney test