Changes in hemoglobin values after anti-D infusion. (A) Mean hemoglobin values for all patients treated with anti-D. The mean pretreatment (day 0) and the mean posttreatment hemoglobin values at 7, 14, 21, 28, and 42 days after the initial anti-D infusion are shown on y-axis; the days after treatment are shown on the x-axis. SEs and number of patients (N) evaluated at each time point are indicated. (B) Distribution of the hemoglobin changes for the entire study population. The differences between the pretreatment and the day 7 posttreatment hemoglobin values after the initial anti-D infusion are depicted on the x-axis; the percentage of patients within each group is shown on the y-axis.