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Table 3 Cases of hypertension and associated exposure to different noise frequencies

From: Road traffic noise frequency and prevalent hypertension in Taichung, Taiwan: A cross-sectional study

Characteristics

Case group (n = 46)

Control group (n = 774)

Total subjects (n = 820)

P-value

LAeq 8 h (dBA)

    

 Median (Q1, Q3)

81 (79, 82)

79 (77, 82)

79 (77, 82)

0.016a

Frequency components

   

31.5 Hz (dB)

    

 Median (Q1, Q3)

29 (26, 31)

27 (25, 30)

27 (25, 30)

0.222a

63 Hz (dB)

    

 Median (Q1, Q3)

43 (41, 45)

41 (38, 44)

41 (38, 44)

0.026a

125 Hz (dB)

    

 Median (Q1, Q3)

50 (48, 52)

49 (47, 51)

49 (47, 51)

0.032a

250 Hz (dB)

    

 Median (Q1, Q3)

55 (53, 56)

54 (52, 55)

54 (53, 55)

0.017a

500 Hz (dB)

    

 Median (Q1, Q3)

58 (57, 60)

58 (56, 59)

58 (56, 59)

0.032a

1000 Hz (dB)

    

 Median (Q1, Q3)

61 (60, 63)

61 (59, 63)

61 (59, 63)

0.070a

2000 Hz (dB)

    

 Median (Q1, Q3)

59 (57, 61)

59 (57, 61)

59 (57, 61)

0.120a

4000 Hz (dB)

    

 Median (Q1, Q3)

57 (54, 58)

56 (53, 59)

56 (53, 59)

0.458a

8000 Hz (dB)

    

 Median (Q1, Q3)

50 (48, 52)

49 (45, 52)

49 (45, 52)

0.096a

  1. dB = decibel; dBA = A-weighted decibel; LAeq 8 h = A-weighted equivalent sound level at 09:00–17:00; Q1 = first quartile; Q3 = third quartile. aWilcoxon signed rank sum test of the difference between the two groups.