MAPT and supranuclear palsy, progressive, 1: Compared to the LP group, disease onset was later in the PSP tau group (62 ± 11 vs. 66 ± 7 years, p = 0.006), age at death was younger in the GCI group (77 ± 8 vs. 66 ± 9 years, p < 0.001), and disease duration was significantly shorter in all three non-LP groups (15 vs. 8, 7 and 11 years; p < 0.001, p < 0.001 and p = 0.005 respectively).