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Table 2 Distribution of air pollutant exposure in study participants

From: Long-term exposure to air pollution and the risk of developing sudden sensorineural hearing loss

Pollutants Levels SSNHL
(n = 353)
Non- SSNHL (n = 63,968) p Total
(n = 64,321)
PM2.5 (μg/m3) Mean (SD) 35.07 (8.74) 34.79 (8.75) 0.556 34.79 (8.75)
  Low 92 26.1% 21,393 33.4% 0.007 21,485 33.4
  Moderate 133 37.7% 20,202 31.6%   20,335 31.6
  High 128 36.3% 22,373 35.0%   22,501 35.0
SO2 (ppb) Mean (SD) 4.91 (2.50) 4.98 (2.41) 0.557 4.98 (2.41)
  Low 127 36.0% 21,641 33.8% 0.519 21,768 33.8
  Moderate 111 31.4% 19,691 30.8%   19,802 30.8
  High 115 32.6% 22,636 35.4%   22,751 35.4
CO (ppm) Mean (SD) 0.76 (0.33) 0.72 (0.27) 0.010 0.72 (0.27)
  Low 124 35.1% 22,582 35.3% 0.204 22,706 35.3
  Moderate 93 26.3% 19,242 30.1%   19,335 30.1
  High 136 38.5% 22,144 34.6%   22,280 34.6
NO (ppb) Mean (SD) 12.60 (12.70) 11.00 (10.13) < 0.001 11.01 (10.15)
  Low 119 33.7% 21,754 34.0% 0.936 21,873 34.0
  Moderate 109 30.9% 20,140 31.5%   20,249 31.5
  High 125 35.4% 22,074 34.5%   22,199 34.5
NO2 (ppb) Mean (SD) 22.99 (7.49) 22.56 (6.55) 0.216 22.56 (6.56)
  Low 114 32.3% 20,002 31.3% 0.156 20,116 31.3
  Moderate 101 28.6% 21,284 33.3%   21,385 33.2
  High 138 39.1% 22,682 35.5%   22,820 35.5
  1. SD: standard deviation; ppb: parts per billion; ppm: parts per million