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Table 1 Demographic Characteristics of Employees by Workplace Noise Exposure

From: Occupational noise exposure and the prevalence of dyslipidemia in a cross-sectional study

Variables Noise-exposed group control group P valuea
No. % M (QL, QU) No. % M (QL, QU)
Age    35(29, 39)    34(30, 39) 0.300
 < 30 136 27.64   160 24.10   
 30–39 251 51.02   376 56.63   
 40–49 67 13.62   80 12.05   
 50–59 38 7.72   48 7.23   
Sex        < 0.001
 Male 461 93.70   471 70.93   
 Female 31 6.30   193 29.07   
Heart Rate    77(71, 85)    79(72, 86) 0.259
 < 60 12 2.44   8 1.20   
 60–100 466 94.72   634 95.48   
 > 100 14 2.85   22 3.31   
BMI    25.29(22.66, 27.96)    23.73(21.22, 26.20) < 0.001
 < 18.5 12 2.44   28 4.22   
 18.5–23.9 161 32.72   325 48.95   
 24–27.9 200 40.65   242 36.45   
 ≥ 28 119 24.19   69 10.39   
ECG       0.254
 Normal 362 73.58   508 76.51   
 Abnormal 130 26.42   156 23.49   
PTA        < 0.001
 Normal 465 94.51   664 100.00   
 Abnormal 27 5.49   0 0.00   
Hypertension        < 0.001
 Yes 210 42.68   188 28.31   
 No 282 57.32   476 71.69   
Fatty liver        < 0.001
 Yes 279 56.71   243 36.60   
 No 213 43.29   421 63.40   
Diabetes        0.008
 Yes 22 4.47   12 1.81   
 No 470 95.53   652 98.19   
Noise exposure years (years)         13 (8, 19)   
Noise intensity (dB(A))             78.90(78.10, 82.10)   
  1. Abbreviations: BMI body mass index, ECG electrocardiogram, PTA pure-tone audiometry
  2. a χ2 test for the difference (P < 0.05) between the 2 groups