Table 1.

The clinical data of the selected 137 research subjects

Clinical data	Number of cases	The percentage (%)
Gender
Male	76	55.47
Female	61	44.53
Age (years old)
≤50	73	53.28
>50	64	46.72
Smoking history
YES	36	26.28
NO	101	73.72
Education degree
Senior high school or below	81	59.12
College degree or above	56	40.88