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Table 2 Pulse oximeter bias (mean SpO2 - SaO2) (%) in different subgroups of patients.

From: The accuracy of pulse oximetry in emergency department patients with severe sepsis and septic shock: a retrospective cohort study

Parameter Subgroup n Bias (%) p Limits of Agreement
SaO2 <90 27 4.92 0.004 -2.2 to 12.0
  ≥ 90 67 1.89   -2.9 to 6.7
Lactate >2 52 2.58 0.40 -4.2 to 9.3
  ≤ 2 35 3.14   -1.9 to 8.1
  >4 25 2.52 0.67 -6.2 to 11.2
  ≤ 4 62 2.92   -1.8 to 7.8
pH <7.35 43 3.15 0.30 -4.6 to 10.9
  ≥ 7.35 51 2.43   -2.1 to 6.9
Hemoglobin <136 46 3.00 0.42 -4.1 to 10.1
  ≥ 136 42 2.48   -2.4 to 7.4
  <119 22 3.41 0.38 -5.3 to 12.2
  ≥ 119 66 2.53   -2.5 to 7.6
Blood culture Positive 29 3.66 0.06 -3.8 to 11.1
  Negative 47 2.21   -3.3 to 7.7
Vasopressors Yes 40 3.05 0.43 -4.8 to 10.9
  No 48 2.50   -1.8 to 6.8