. 0. Surface-postcrosslinked water-absorbent polymer particles having a change of characteristic swelling time of less than 0.0 and a centrifuge retention capacity of at least 00 g/g, wherein the change of characteristic swelling time is wherein Z is the change of characteristic swelling time, τ0.0 is the characteristic swelling time under a pressure of 0.0 psi (0.0 g/cm0) and τ0.0 is the characteristic swelling time under a pressure of 0.0 psi (00.0 g/cm0). 