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Table 2 Physical characteristics across haemoglobin concentration ([Hb]) group (<10 g dl -1 ; Hb 10 to 12 g dl -1 ; Hb >12 g dl -1 )

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

  [Hb]
  <10 g dl-1 10 to 12 g dl-1 >12 g dl-1
N 83 353 1341
Age (yr) 63.5 (16.8) 61.8 (16.4) 61.8 (15.5)
Height (cm) 165.8 (9.2) 166.1 (9.2) 170.0 (8.9)
Weight (kg) 73.3 (22.1) 78.9 (23.7) 85.7 (23.3)
BMI (kg m-2) 26.8 (8.1) 28.7 (8.7) 29.7 (8.2)
Creatinine (μmol l-1) 79.8 (39.0) 78.7 (29.5) 83.4 (28.9)
V ˙ O 2 peak (ml min-1)a 960 (330) 1150 (430) 1380 (500)
V ˙ O 2 peak (ml kg-1 min-1)b 13.0 (4.5) 14.5 (5.4) 16.1 (5.8)
V ˙ O 2 peak (ml kg-0.83 min-1)c, g 27.8 (6.9) 31.5 (8.1) 34.3 (8.1)
AT (ml min-1)d 760 (190) 860 (260) 970 (310)
AT (ml kg-1 min-1)e 10.3 (2.5) 10.9 (3.2) 11.3 (3.6)
AT (ml kg-0.83 min-1)f, g 21.3 (4.3) 23.5 (4.8) 24.4 (4.8)
V ˙ E / V ˙ O 2 26.7 (4.8) 25.3 (5.4) 26.0 (6.8)
V ˙ E / V ˙ C O 2 31.7 (5.9) 30.2 (5.9) 31.0 (6.6)
  1. BMI body mass index, V ˙ E / V ˙ O 2 and V ˙ E / V ˙ C O 2 , ventilatory equivalents for oxygen and carbon dioxide at the AT; AT, anaerobic threshold; V ˙ O 2 peak, peak oxygen uptake. Values are mean (SD). aANOVA, P <0.0001; linear trend, P <0.0001. bANOVA, P <0.0001; linear trend, P < 0.0001. cANOVA, P <0.0001; linear trend, P <0.0001; dANOVA, P <0.0001; elinear trend, P < 0.0001; flinear trend, P < 0.0001; gAdjusted for weight, testing site, age, sex, revised cardiac risk index, diabetes, creatinine and operation category.