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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Anesth Analg. 2018 Mar;126(3):913–919. doi: 10.1213/ANE.0000000000002532

Table 3.

Comparison of the Features Distinguishing Preeclampsia from HTN

Features Preeclampsia (mean ± SD) Control (mean ± SD) P
Mann-Whitney U
pRR50 (percent) 6.39 ± 1.85 12.75 ± 2.88 0.081
Low Frequency / (Low Frequency + High Frequency) (percent) 0.193 ± 0.016 0.262 ± 0.024 0.019
Peak to Peak Interval (seconds) 0.751 ± 0.019 0.721 ± 0.015 0.395
Variance of Crest Time (seconds2) 4.4*10−4 ± 0.69*10−4 9.3*10−4 ± 2*10−4 0.063
Variance of Spring Constant (PPG amplitude/seconds2)2 2164 ± 351) 5296 ± 1219 0.011