Mean platelet increments in neonates with NAIT following HPA-1a/5b–negative platelet transfusions or random donor platelet transfusions. The mean platelet increments in neonates with anti–HPA-1a– and/or anti–HPA-5b–mediated NAIT following HPA-1a/5b–negative platelet transfusions (n = 29) (open circles) or random donor platelet transfusions (n = 9) (closed squares) are shown. The error bars represent the standard deviation of the measurements. The dotted curves represent the fitted exponential decay curves to the data. The individual patient data are given in Figure 2.