Perioperative Medicine

Table 3 Allometrically scaled oxygen uptake

From: Association between preoperative haemoglobin concentration and cardiopulmonary exercise variables: a multicentre study

	Haemoglobin concentration			P-value
	<10 g dl^-1	10 to 12 g dl^-1	>12 g dl^-1	ANOVA	Trend
$\dot{V} O_{2}$ peak (ml kg^-0.83.min^-1)	26.7 (7.8) 83	29.9 (8.4) 352	34.4 (10.1) 1339	<0.0001	<0.0001^a
	27.8 (7.1) 83	31.2 (8.2) 352	34.0 (8.7) 1333	<0.0001	<0.0001^b
	27.8 (6.9) 64	31.5 (8.1) 291	34.3 (8.1) 1136	<0.0001	<0.0001^c
AT (ml kg^-0.83.min^-1)	20.9 (4.6) 67	22.7 (5.0) 307	24.4 (5.2) 1257	<0.0001	<0.0001^a
AT (ml kg^-0.83.min^-1)	21.3 (4.5) 67	23.2 (4.9) 307	24.3 (5.1) 1251	<0.0001	<0.0001^b
	21.3 (4.3) 49	23.5 (4.8) 252	24.4 (4.8) 1068	<0.0001	<0.0001^c

$\dot{V} O_{2}$ peak and AT, mean (SD) number of patients, by haemoglobin classification. AT anaerobic threshold, [Hb] haemoglobin concentration, $\dot{V} O_{2}$ peak, peak oxygen uptake.
^aAdjusted for weight and testing site.
^bAdjusted for weight, testing site, age, sex.
^cAdjusted for weight, testing site, age, sex, revised cardiac risk index, diabetes, creatinine and operation category.

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ISSN: 2047-0525

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