Table 3. Adjusted Odds Ratios (95% CI) of Nitrogen Dioxide (NO₂) for 14 Days (0.1 ppm) for Peritonsillar Abscess in Subgroup Analysis According to Age and Sex.

Subgroup	Participants, No.	Peritonsillar Abscess, NO2, aOR (95% CI)
Total	19 210	12.8 (8.4-19.5)
Age (0-29 y)
Men	4235	9.7 (4.0-23.5)
Women	3175	4.3 (1.5-12.1)
Age (30-59 y)
Men	6380	17.7 (8.5-36.6)
Women	3955	31.4 (12.3-80.3)
Age (≥60 y)
Men	645	11.1 (1.0-127.4)
Women	705	4.2 (0.4-46.9)

Abbreviation: aOR, adjusted odds ratio.