Table 1

Value of exhaled nitric oxide, sputum eosinophilia or a combination in predicting steroid response

Change in FEV1(%) Predictive value
<15% ⩾15% Negative Positive Sensitivity Specificity
Nitric oxide
 <10 ppb18772%59%
 ⩾10 ppb21083%90%
Sputum eosinophilia
 <4%13668%54%
 ⩾4%4764%76%
Increased NO and/or eosinophil count
 No15479%76%
 Yes51372%75%