Table 2: Assessment of the ability of modified API to predict time course development of asthma in adolescence in the study population.

Asthma at the follow-up end point Sensitivity % (CI-95%) Specificity % (CI-95%) PPV %(CI-95%) NPV %(CI-95%) Area under the ROC curve Correctly predicted, % Positive API 87 (79–92) 37 (28–47) 61 (53–68) 71 (57–82) 0.62 68.7

PPV: positive predictive value; NPV: negative predictive value. ROC: receiver operating characteristic curve. API: asthma predictive index.