Fig. 4.

Differential metabolites in the sera of H7N9-infected patients. Supervised univariate nonparametric analysis (Mann-Whitney U test) is used to confirm 21 serum metabolites out of 23 that distinguish H7N9-infected patients from healthy controls. Boxes represent the interquartile ranges (IQRs) between the first and third quartiles, and the lines inside the boxes represent the median; whiskers represent the lowest or highest values within 1.5 times the IQR from the first or third quartiles. *P < 0.05, **P < 0.01, ***P < 0.001.