Table 4. Adjusted ORs (95% CI) for hearing loss and As levels in biological samples (n = 145)^a.

	1 kHz (≥ 7 dB)	4 kHz (≥ 10 dB)	8 kHz (≥ 24 dB)	12 kHz (≥ 45 dB)
As in toenails
Low	Reference	Reference	Reference	Reference
High	1.28 (0.43–3.83)	4.27** (1.51–12.05)	3.91** (1.47–10.38)	4.15** (1.55–11.09)
As in urine
Low	Reference	Reference	Reference	Reference
High	0.69 (0.29–1.63)	1.89 (0.83–4.29)	1.48 (0.65–3.34)	1.15 (0.52–2.56)

OR, odds ratio; CI, confidence interval. References mean 1.00.

^aAdjusted for age, sex, smoking history and BMI.

**p < 0.01.