Table 2 Unadjusted and adjusted OR and 95% CI of NO₂ exposure with ARI symptoms

Continuous NO₂ (10 mol/m²)

1.22 (1.03—1.44)^a

1.27 (1.06—1.52)^a

Categorical

Q1 (8.34 – 13.52 mol/m²)

1 (Reference)

1 (Reference)

Q2 (13.53 – 16.07 mol/m²)

1.23 (0.79—1.91)

1.30 (0.83—2.02)

Q3 (16.08 – 18.89 mol/m²)

1.16 (0.75—1.81)

1.21 (0.77—1.91)

Q4 (18.90 – 69.29 mol/m²)

1.53 (1.00—2.32)^a

1.71 (1.08—2.69) ^a