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 |