Epidermal Growth Factor Receptor Protein: A Biological Marker for Oral Precancer and Cancer

Table 2

Comparison of EGFR expression with individual parameters.

Parameters	𝑛	Mean	SD	𝑍/𝜒^2	𝑃	Inference
TNM staging 𝑇
𝑇2	5	74.8	33.9	𝑍=1.416	0.165	NS
𝑇4	10	64.3	27.0
𝑁
0	4	57.3	35.6	𝜒^2=4.639	0.200	NS
1	3	90.0	8.7
2	5	52.6	34.7
3	3	71.7	5.8
𝑀
—	—	—	—	—	—	—
Age
≤40 yrs	12	27.9	21.7	𝑍=2.135	0.033	Significant
>40 yrs	18	55.8	33.6
Tobacco habit
No	5	11.5	6.2	𝑍=3.316	0.001	Significant
Yes	25	52.6	30.3
Duration of tobacco habit
No history	5	11.6	6.2	𝜒^2=12.645	<0.001	HS
Up to 10	10	50.9	27.3
11–20	11	48.3	34.3
21–30	4	68.8	27.5