Table 3. Comparsion of the micro current value in malignant tumor and paracancerous tissues.

Groups	Tissue type	Tissue number	Micro current value (μA)
1	Malignant tumor	102	33.3 ± 8.9
2	Paracancerous tissue	59	18.9 ± 4.1
3	Normal tissue	76	14.2 ± 4.0
4	Surgical margin tissue	41	15.2 ± 3.3

p(1 vs. 2, 3 or 4) < 0.001; p(2 vs. 3) < 0.001; p(3, 4) > 0.05.