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Time to exacerbation or death (unadjusted). (A) Kaplan–Meier curve of time to exacerbation or death in control group and eosinophil-guided group in current smokers, HR = 0.99 (95% CI, 0.60–1.64), p = 0.98 (log-rank test) and (B) in ex-smokers, HR = 1.17 (95% CI, 0.8–1.72); p = 0.43.
