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Table 1 Basic characteristics of noise- exposed and control group

From: Noise exposure in occupational setting associated with elevated blood pressure in China

variables

Noise-exposed group (n = 1390)

control group (n = 1399)

P value

Age (years) (mean ± SD)

33.1 ± 8.7

33.1 ± 8.6

0.941#

Smoking status (%)

 Yes

56.2

46.6

 

 No

43.8

53.4

<0.001§

Drinking (%)

 Yes

68.6

41.0

 

 No

31.4

59.0

<0.001§

Years to noise exposure, years,*

4.2(1.7,8.0)

  

Noise intensity exposure, dB (A),*

87.5 (82.5,87.5)

  

cumulative noise exposure (CNE)*

92.3(88.3,96.8)

  

Noise protection (%)

83.8

  
  1. CNE, cumulative noise exposure, was calculated as CNE = 10 × log 10SPL × years of noise exposure), where, SPLis the sound pressure level [dB (A)] of noise exposure
  2. *Data are presented as median (P25, P75)
  3. #independent t-test; §, χ 2 test