Across 167 included studies, more consistently reported factors were older age, male sex, APOEe4, GBA, changes in cognition, mood, behavior, sleep, gait/posture, speech, parkinsonism, smell loss, autonomic dysfunction, white matter disease on MRI, lower CSF amyloid β42 and higher CSF/blood neurofilament light chain. Here, NEFL is linked to Parkinsonism.