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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.