TABLE 1.

Summary frequencies binned according to clinically useful parameter thresholds^*

ICP Pulsatility Parameters	Mean ICP†		p Value‡
	<15 mm Hg	≥ 15 mm Hg
mean dP
1.0≤dP<5.0	784,251 (39.2)	198,328 (9.9)
dP≥5.0	553,551 (27.7)	462,814 (23.2)	<0.001
mean dT
0.1≤dT<0.20	314,497 (15.7)	182,954 (9.2)
dT≥0.2	1,023,305 (51.2)	478,188 (23.9)	<0.001
mean dP/dT
0.0≤dP/dT<20	692,189 (34.6)	211,547 (10.6)
dP/dT≥20	645,613 (32.3)	449,595 (22.5)	<0.001

^*The numbers include 1,998,944 observations of mean ICP wave amplitude, latency, and rise-time coefficient.

^†Numbers in columns represent the number of observations with the percentages in parentheses.

^‡Significance was assessed using the Fisher exact test (2-sided p value).