What is the negative predictive value of a completely unremarkable EMU admission?

Agree... A "negative" EMU evaluation does not, of course, rule out epilepsy.

"Unremarkable" or "inconclusive" means the event in question was not recorded and there were no interictal epileptiform abnormalities. In our own study [Benbadis et al., PMID 15329081], we found that represented 15% of EMU ...

There is no answer for this specific question, which I assume is meant to ask how certain we can be that the patient does not have epilepsy.

This paper (Robinson et al., PMID 21507729) reported on predictors of a non-diagnostic LTM stay, and found that absence of epilepsy risk factors and the presenc...