marginally non-significantp = 0.054
In the prespecified primary multivariable model, RF positivity was marginally non-significant (aOR 3.44, 95% CI 0.98–12.11, p = 0.054), but became significant in the PFT analysis, but became non-significant after adding dyspnea/Velcro crackles and in the matched analysis, suggesting that any RF signal was not solely explained by symptom-driven ascertainment.