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Table 2 Preoperative waveform analysis for upper and lower extremities and their differences

From: Using pulse oximetry waveforms to detect coarctation of the aorta

Preop featureControlCoarctationp value
Median [Q1, Q3]
ARR_u4.66 [4.38, 5.07]4.52 [4.41, 4.88]0.16
ARF_u− 1.72 [− 1.87, − 1.53]− 1.67 [− 1.75, − 1.53]0.96
MRR_u5.05 [4.71, 5.46]4.98 [4.76, 5.26]0.24
MRF_u− 2.63 [− 2.81, − 2.47]− 2.64 [− 2.73, − 2.51]0.6
ARR_l4.9 [4.42, 5.32]4.9 [4.47, 5.31]0.91
ARF_l− 1.53 [− 1.65, − 1.41]− 1.49 [− 1.59, − 1.35]0.38
MRR_l5.27 [4.77, 5.68]5.32 [4.87, 5.7]0.84
MRF_l**− 2.6 [− 2.67, − 2.52]− 2.34 [− 2.5, − 2.3]0.009
∆ARR− 0.22 [− 0.52, − 0.13]− 0.12 [− 0.45, 0.02]0.5
∆ARF− 0.12 [− 0.31, − 0.02]− 0.2 [− 0.26, − 0.01]0.22
∆MRR− 0.22 [− 0.44, − 0.11]− 0.12 [− 0.46, 0.02]0.54
∆MRF**− 0.07 [− 0.2, 0.08]− 0.24 [− 0.38, − 0.13]0.001
  1. Units for slope are normalized amplitude/time and values are reported as the median, 1st and 3rd quartiles of PPG features. Subscripts indicate upper (u) vs lower (l) extremity acquisition site. The ∆ indicates the difference between the upper and lower extremity for that feature. Features with statistical significance between the 2 groups are marked as **p value < 0.01
  2. ARR average rate of rise, ARF average rate of fall, MRR maximum rate of rise, MRF maximum rate of fall, COA coarctation of the aorta, Q1 1st quartile, Q3 3rd quartile