CRP and idiopathic interstitial pneumonia: Genetically predicted higher plasma CRP levels showed a suggestive inverse association with IPF using IVW method (fixed-effect model: OR, 1.000; 95% CI, 0.999-1.000, P = 0.217; random-effect model: OR, 1.000; 95% CI, 0.999-1.000, P = 0.214) (Fig. 2).