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Table 3 Adjusted OR (95% CIs) from the weighted quantile sum (WQS) regressions for ACPA positivity

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

Threshold of ACPA positivity OR (95% CI) Weight
SO2 NO2 PM2.5
20 units/ml (N positive = 786) 1.36 (1.10–1.69) 0.12 0.00 0.88
40 units/ml (N positive = 292) 1.43 (1.05–1.96) 0.28 0.18 0.54
60 units/ml (N positive = 134) 1.33 (0.85–2.10) 0.22 0.14 0.64
  1. Adjusted ORs are per increase of an interquartile range of the logarithmically transformed industrial air pollutants. Variables adjusted for include age, sex, ancestry, smoking, and annual income level