Table 2.

Adjusted odds ratios (95% confidence intervals) of NO₂ for 14 days (0.1 ppm) for sudden sensory neural hearing loss in total and subgroup analyses according to age and sex.

Participants	N (participants)	Sudden sensory neural hearing loss
		AOR of NO2	P-value
Total	26,000	3.12 (2.16–4.49)	<0.001*
Age (<30 years old), men	1,520	2.05 (0.45–9.36)	0.354
Age (<30 years old), women	1,645	0.83 (0.19–3.61)	0.803
Age (30–59 years old), men	6,690	3.64 (1.76–7.50)	<0.001*
Age (30–59 years old), women	8,145	3.96 (2.07–7.56)	<0.001*
Age (≥60 years old), men	3,310	4.06 (1.41–11.61)	0.009*
Age (≥60 years old), women	4,690	2.56 (1.08–6.06)	0.032*

*Logistic regression model adjusted model for age, sex, income, region of residence, hypertension, diabetes, and dyslipidemia, significance at P < 0.05.