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 | ||