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. Author manuscript; available in PMC: 2006 Jan 25.
Published in final edited form as: Neurosurgery. 2004 Sep;55(3):582–593. doi: 10.1227/01.neu.0000134385.23401.01

TABLE 3.

Relationships of interest between adjustable valve pressure and ventricular volume for the total population of 34 patientsa

Relationship of interest between valve pressure setting and ventricular volume Slope ± SD Intercept ± SD Correlation coefficient P value
Individual values of P and V across all subjects 0.456 ± 0.22 71.03 ± 23 0.342 P = 7.2E-05
Individual values of ΔP and corresponding values of ΔV across all subjects 0.262 ± 0.159 -4.786 ± 5.02 0.327 P = 1.5E-03
Average individual values of P and V within each subject 0.353 ± 0.534 88.71 ± 55.7 0.231 P = 1.9E-01
Average values for ΔP and ΔV within each subject 0.533 ± 0.226 0.358 ± 6.32 0.648 P = 3.4E-05
Average ΔP/ΔT and ΔV/ΔT for each subject 0.549 ± 0.178 0.039 ± 0.61 0.744 P = 4.6E-07
a

All subjects with at least two computed tomographic scans for volumetric analysis excluding the 17 outliers as listed under "Correlation of Ventricular Volume with Adjustable Valve Pressure."

SD, standard deviation.