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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
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 <0.0001a
27.8 (7.1) 83 31.2 (8.2) 352 34.0 (8.7) 1333 <0.0001 <0.0001b
27.8 (6.9) 64 31.5 (8.1) 291 34.3 (8.1) 1136 <0.0001 <0.0001c
AT (ml kg-0.83.min-1) 20.9 (4.6) 67 22.7 (5.0) 307 24.4 (5.2) 1257 <0.0001 <0.0001a
21.3 (4.5) 67 23.2 (4.9) 307 24.3 (5.1) 1251 <0.0001 <0.0001b
  21.3 (4.3) 49 23.5 (4.8) 252 24.4 (4.8) 1068 <0.0001 <0.0001c
  1. V ˙ O 2 peak and AT, mean (SD) number of patients, by haemoglobin classification. AT anaerobic threshold, [Hb] haemoglobin concentration, V ˙ O 2 peak, peak oxygen uptake.
  2. aAdjusted for weight and testing site.
  3. bAdjusted for weight, testing site, age, sex.
  4. cAdjusted for weight, testing site, age, sex, revised cardiac risk index, diabetes, creatinine and operation category.