Figure 3.

Analysis of interaction between signal unit ratio within CSF of lateral ventricle and choroid plexus in REF and iNPH cohorts at 24 h. The mean relative signal unit ratios within choroid plexus and CSF of the lateral ventricle are shown for the REF and iNPH subjects. Hence, the mean difference in normalized T1 signal unit between choroid plexus and CSF was different in the iNPH than REF subjects (interaction term, P < 0.001), and the mean normalized T1 signal in choroid plexus was higher in the iNPH than REF subjects (P = 0.004). The observation suggests impaired clearance of CSF tracer from choroid plexus of iNPH than REF individuals. Error bars are 95% CI.

iNPH: idiopathic normal pressure hydrocephalus; CSF: cerebrospinal fluid; REF: reference patients.