Table 4.

Results from one-pollutant and two-pollutant models for adjusted association between ALS risk and various air pollutants.

Air pollutants	One-pollutant model OR (95% CI)a	Two-pollutant model OR (95% CI)a
${\mathrm{PM}}_{2.5}$ absorbance  (adjusted for ${\mathrm{PM}}_{2.5}$)
Q1	Reference	Reference
Q2	1.14 (0.88–1.47)	1.21 (0.92–1.59)
Q3	1.12 (0.86–1.47)	1.20 (0.90–1.62)
Q4	1.67 (1.27–2.18)	1.73 (1.26–2.37)
${\text{NO}}_2$
Q1	Reference	Reference
Q2	1.38 (1.09–1.76)	1.41 (1.11–1.80)
Q3	1.25 (0.97–1.63)	1.28 (0.98–1.67)
Q4	1.74 (1.32–2.30)	1.73 (1.29–2.30)
${\text{NO}}_{\mathrm{x}}$
Q1	Reference	Reference
Q2	0.98 (0.78–1.24)	0.98 (0.77–1.25)
Q3	1.12 (0.87–1.43)	1.13 (0.88–1.46)
Q4	1.38 (1.07–1.77)	1.33 (1.02–1.75)
${\mathrm{PM}}_{2.5}$ (adjusted for ${\text{NO}}_2$)
Q1	Reference	Reference
Q2	0.98 (0.75–1.28)	0.90 (0.69–1.19)
Q3	0.85 (0.62–1.16)	0.75 (0.55–1.04)
Q4	1.35 (0.97–1.88)	1.15 (0.81–1.62)

^aMain model 1 was used for the comparison; this confounder model was adjusted for gender, age, educational level, current smoking status, current alcohol consumption, body mass index (BMI), and socioeconomic status (SES).