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Table 2 Comparison of peripheral oxygen saturation (SpO2) and oxygen reserve index (ORI) in patients with and without SpO2  <  97% during endotracheal intubation (ETI)

From: Oxygen reserve index for non-invasive early hypoxemia detection during endotracheal intubation in intensive care: the prospective observational NESOI study

  Total n  =  51 SpO2  ≥  97% n  =  31 SpO2  <  97% n  =  20 P value
SpO2 at the start of preoxygenation, median [IQR] 97.00 [95.00–99.00] 98.00 [95.00–100.00] 97.00 [95.00–97.00] 0.0951
SpO2 at the end of preoxygenation, median [IQR] 100.00 [99.00–100.00] 100.00 [99.00–100.00] 100.00 [99.00–100.00] 0.5931
SpO2 at ETI, median [IQR] 99.00 [95.00–100.00] 100.00 [99.00–100.00] 93.00 [85.50–97.00] < 0.0001
ORI at the start of preoxygenation, median [IQR] 0.04 [0.01–0.13] 0.05 [0.02–0.20] 0.04 [0.01–0.12] 0.2891
ORI at the end of preoxygenation, median [IQR] 0.62 [0.26–0.83] 0.71 [0.54–0.94] 0.39 [0.15–0.65] 0.0082
Change in ORI from start to end of preoxygenation, median [IQR] 0.46 [0.15–0.64] 0.52 [0.23–0.82] 0.17 [0.10–0.50] 0.0191
Highest ORI during preoxygenation, median [IQR] 0.67 [0.31–0.94] 0.77 [0.59–1.00] 0.49 [0.22–0.77] 0.0212
Changes in SpO2 from start to end of preoxygenation, median [IQR] 3.00 [1.00–4.00] 2.00 [0.00–4.00] 3.00 [2.00–5.00] 0.1181
  1. SpO2 oxygen saturation by pulse oximeter; IQR interquartile range; ETI endotracheal intubation; ORI oxygen reserve index