Table 2

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

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

Wilson et al. BMC Emergency Medicine 2010 10:9   doi:10.1186/1471-227X-10-9