Per cent proportion of non-invasive estimator of CPP fitting 5, 10, and 15 mm Hg error ranges compared with direct (invasive) CPP (n=12725 1 minute averages)

Error		All 1 minute averages			Day averages
Error		nCPP	Left nCPP		Right nCPP	nCPP	Left nCPP	Right nCPP
<5 mm Hg	49	38	41	58	39	44
<10 mm Hg	81	71	72	89	76	78
<15 mm Hg	94	91	87	94	92	90

nCPP=Global non-invasive CPP; left nCPP= left hemisphere nCPP; right nCPP= right hemisphere nCPP