Table 2 Distribution of hearing thresholds and environmental exposure.

Variable	Mean	SD	Percentile
Variable	Mean	SD	1st	25th	50th	75th	99th
Left ear	20.62	4.21	10.00	20.00	20.00	20.00	34.57
Right ear	21.01	4.70	10.00	20.00	20.00	21.00	37.00
Environmental exposure
NDVI250	0.49	0.17	0.34	0.34	0.42	0.62	0.84
NDVI500	0.49	0.14	0.34	0.38	0.42	0.58	0.82
NDVI1000	0.49	0.12	0.34	0.41	0.46	0.56	0.78
SAVI250	0.31	0.12	0.17	0.21	0.26	0.41	0.60
SAVI500	0.31	0.11	0.18	0.22	0.25	0.39	0.59
SAVI1000	0.31	0.10	0.18	0.22	0.26	0.38	0.56
NO₂ug/m³	31.17	0.82	29.29	30.98	30.99	31.58	34.13
PM_2.5ug/m³	46.34	0.70	45.54	45.87	46.00	46.93	47.52
PM₁₀ug/m³	92.43	1.36	89.89	92.14	92.96	92.97	95.70
SO₂ug/m³	7.95	0.29	7.37	7.64	8.09	8.10	8.25
O₃ug/m³	106.11	1.118	104.83	105.59	105.88	105.96	108.86

SD , Standard deviation; PM_2.5, Particulate matter with diameter less than 2.5 μm; PM₁₀, Particulate matter with diameter less than 10 μm; NO₂, Nitrogen dioxide; SO₂, Sulfur dioxide; O₃, Ozone; NDVI 250 m, 500 m, 1000 m = normalized difference vegetation index at each subject’s workplace address with 250 m, 500 m, 1000 m buffers; SAVI 250 m, 500 m, 1000 m = soil-adjusted vegetation index at each subject’s workplace address with 250 m, 500 m, 1000 m buffers.

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