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Table 2 Adjusted OR (95% CIs) from the single-pollutant logistic regression models for ACPA positivity

From: Long-term exposure to a mixture of industrial SO2, NO2, and PM2.5 and anti-citrullinated protein antibody positivity

Exposure variable Positivity: ≥60 units/ml (N positive = 134) Positivity: ≥40 units/ml (N positive = 292) Positivity: ≥20 units/ml (N positive = 786)
Industrial SO2 1.03 (0.98–1.08) 1.03 (1.00–1.07)* 1.03 (1.00–1.06)*
Industrial NO2 0.90 (0.63–1.28) 1.14 (0.91–1.41)* 1.01 (0.86–1.17)*
Industrial PM2.5 1.17 (0.92–1.48) 1.21 (1.02–1.42) 1.19 (1.04–1.36)
Overall PM2.5 0.94 (0.89–1.01) 0.95 (0.91–1.01) 0.98 (0.95–1.01)
  1. Adjusted ORs (95% CI) for industrial SO2 and NO2 are per 1 ppb increase while they are reported per 1 μg/m3 increase for regional and overall PM2.5 levels. Variables adjusted for include age, sex, ancestry, smoking, and annual income level. *Statistically significant associations include industrial PM2.5 (where 95% CIs exclude the null value) and industrial SO2 (where 95% CIs just barely include the null value)