Hemoglobin values during and after treatment with pegylated interferon and ribavirin in patients with chronic hepatitis C with and without G6PD deficiency. (A) Mean absolute hemoglobin values (Hb). □, patients with G6PD deficiency; ▪, patients without G6PD deficiency. Mann-Whitney tests were performed. ^*P < .005 and ^**P < .001 for the comparison between patients with and without G6PD deficiency. (B) Mean changes in hemoglobin levels from baseline. Mann-Whitney tests were performed. †P = .026 and ^**P < .001 for the comparison between patients with and without G6PD deficiency. Data are expressed as means ± SE.