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Table 1 The effects of anaemia and acidosis on bias and limits of agreement

From: Do changes in pulse oximeter oxygen saturation predict equivalent changes in arterial oxygen saturation?

  

Haemoglobin concentration (g/dl)

Hydrogen ion concentration (nmol/l)

 

Total

<8

8–12

>12

25–63

>63

n (measurements)

1132

49

963

120

1064

58

Bias

1.34

2.09*

1.37*

0.72†‡

1.39

0.38§

Upper limit

4.97

7.04

4.87

4.37

4.95

4.61

Lower limit

-2.29

-2.79

-2.14

-2.93

-2.18

-3.85

  1. P < 0.01, versus *haemoglobin >12 g/dl, †haemoglobin <8 g/dl, ‡haemoglobin 8–12 g/dl and §hydrogen 25–63 nmol/l.
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Critical Care

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