Fig. 2

The exacerbation-risk score and its accuracy. a Definition of the exacerbation-risk score. Scores of 1 and 2 were based on the coefficients calculated in Table 3 (high serum sST2 level, 1.70; blood neutrophilia, 2.94) (b) The exacerbation-risk score predicted asthma exacerbation with an AUC (95% CI) of 0.91 (0.79–1.02) (P < 0.001) in the ROC curve analysis. c Odds ratios predicting exacerbation risk for scores of 1, 2, and 3 as compared with a score of 0. d Survival analysis comparing time to exacerbation among patients with scores ranging from 0 to 3. P < 0.05: score 0 vs. 2, score 0 vs. 3, and score 1 vs. 2. (B–D) P-values were calculated using a ROC curve analysis (b), Fisher’s Exact test (c), and Log-Rank test (d). CI, confidence interval