Skip to main content

Table 1 Demographic characteristics of study subjects

From: A missense variant rs2585405 in clock gene PER1 is associated with the increased risk of noise-induced hearing loss in a Chinese occupational population

Variables

Cases (n = 432)

Controls (n = 837)

P

n

%

n

%

 

Age (years)

0.09a

Mean ± SD

47.85 ± 5.48

47.43 ± 5.38

0.18b

 ≤ 35

13

1.0

26

2.1

 

35–45

89

7.0

219

17.3

 

 > 45

330

26.0

592

46.7

 

Sex

0.40a

Male

392

30.9

771

60.8

 

Female

40

3.2

66

5.2

 

Tobacco use

0.93a

Now

194

15.3

372

29.3

 

Ever

170

13.4

338

26.6

 

Never

68

5.4

127

10.0

 

Alcohol consumption

0.79a

Now

192

15.1

356

28.1

 

Ever

33

2.6

63

5.0

 

Never

207

16.3

418

32.9

 

Duration of noise exposed work (years)

0.75a

Mean ± SD

23.72 ± 10.58

23.68 ± 10.55

0.95b

 ≤ 16

84

6.6

169

13.3

 

 > 16

348

27.4

668

52.6

 

Noise exposure levels (dB)

0.17a

 ≤ 85

265

20.9

474

37.4

 

85–92

126

9.9

288

22.7

 

 > 92

41

3.2

75

5.9

 

High frequency hearing thresholds (dB)

 < 0.001 a

Mean ± SD

0.64 ± 0.48

 

0

 < 0.001 b

 ≤ 26

155

12.2

837

66.0

 

 > 26

277

21.4

0

0.0

 
  1. aStudents’ t-test
  2. bTwo-sided χ2 test