Research and Discussion on the Relationships between Noise-Induced Hearing Loss and ATP2B2 Gene Polymorphism

Table 1

Demographic characteristics of study subjects.

Variables	Case group ()		Control group ()
		%		%
Age (years)
					0.567^a
Sex
Male	358	94.2	355	93.4	0.652^b
Female	22	5.8	25	6.6
Tobacco use
Now	223	58.7	210	55.3	0.501^b
Ever	9	2.4	13	3.4
Never	148	38.9	157	41.3
Alcohol consumption
Now	169	44.5	173	45.5	0.836^b
Ever	8	2.1	10	2.6
Never	203	53.4	197	51.8
Work time with noise (years)
					0.452^a
Expose level with noise (dB)
					0.269^a
High-frequency hearing threshold (dB)
					<0.001^c
≤25	0	0.0	380	100.0
>25	380	100.0	0	0.0

^aStudents’ -test. ^bTwo-sided test. ^cFisher’s exact test.