Figure 1

Dose of azathioprine in <1.0 mg/kg group and 1.0-2.0 mg/kg group at different time points. The patients treated with AZA were divided into <1.0 mg/kg group and 1.0-2.0 mg/kg group according to their initial dose. The doses of AZA were adjusted according to efficacy and tolerance during the 2-year period. The mean dose of <1.0 mg/kg group remained under 1.0 mg/kg. * P < 0.01 compared the dose of <1.0 mg/kg group with 1.0-2.0 mg/kg group.