This table depicts the subject’s self-assessment of their smell perception prior to the Sniffin’ Sticks test. The participants were asked to judge their ability to smell as either “average”, “better than average” or “worse than average". In the table, G+=NTG patients with PVD; G-=NTG patients without PVD; H⁺=Healthy subjects with PVD; H-=Healthy subjects without PVD; PVD=Primary vascular dysregulation.