highly significantp < 0.01
Similarly, a non-parametric Mann–Whitney U test indicated a highly significant difference in the age at diagnosis between patients with non-GEP NETs and those with GEP-NETs [46.00 (IQR 32.00) years vs. 62.00 (IQR 15.00) years, U = 163, p < 0.01, pFDR ≤ 0.01, r = 0.52] ( Figure 3 ).