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Table 2 Characteristics of noise-exposed workers

From: A risk model and nomogram for high-frequency hearing loss in noise-exposed workers

Variable

All subjects

Training cohort

Validation cohort

(n = 32,121)

(n = 25,732)

(n = 6389)

n

%

n

%

n

%

Sex

 Male

23,661

73.66

6828

73.46

1632

74.46

 Female

8460

26.34

18,904

26.54

4757

25.54

Age (years)

  < 25

1908

5.94

1525

5.93

383

5.99

 25–29

4191

13.05

3369

13.09

822

12.87

 30–34

3888

12.10

3120

12.12

768

12.02

 35–39

4559

14.19

3675

14.28

884

13.84

 40–44

8868

27.61

7085

27.53

1783

27.9

  ≥ 45

8707

27.11

6958

27.04

1749

27.38

NED (years)

 0–4

13,511

42.06

10,840

42.13

2671

41.81

 5–9

8137

25.33

6521

25.34

1616

25.29

 10–14

3742

11.65

2967

11.53

775

12.13

 15–19

2006

6.25

1625

6.32

381

5.96

 20–24

2775

8.64

2227

8.65

548

8.58

 25–29

1441

4.49

1152

4.48

289

4.52

  ≥ 30

509

1.58

400

1.55

109

1.71

Industry type

 Manufacturing

23,295

72.52

18,673

72.57

4622

72.34

 Construction

294

0.92

232

0.90

62

0.97

 Mining

3341

10.40

2670

10.38

671

10.51

 Others a

5191

16.16

4157

16.15

1034

16.18

Enterprise type

 SOE

9661

30.08

7762

30.16

1899

29.72

 FOE

2446

7.61

1978

7.69

468

7.33

 POE

20,014

62.31

15,992

62.15

4022

62.95

  1. Abbreviations: NED noise exposure duration, FOE foreign-owned enterprise, SOE state-owned enterprise, POE private-owned enterprise
  2. aOthers included the transportation industry, storage industry, postal industry, agricultural industry, and fishery and animal husbandry industry