Table 3

Patient characteristics of the three study groups

Group AGroup BGroup C
haemoglobin <6 mmol/l (haemoglobin <97 g/l)haemoglobin 6–7 mmol/l (haemoglobin 97–113 g/l)haemoglobin 7–8 mmol/l (haemoglobin 113–129 g/l)
No of infantsN=8N=18N=14
No of measurementsN=9N=21N=17
Haemoglobin before transfusion (mmol/l)5.7 (3.7–5.9)6.7 (6.1–6.9)7.3 (7.0–7.9)
Haemoglobin before transfusion (g/l)92 (60–95)108 (98–111)118 (113–127)
Haematocrit before transfusion0.26 (0.19–0.28)0.31 (0.27–0.33)0.34 (0.31–0.36)
Haemoglobin after transfusion (mmol/l)8.0 (6.9–9.5)8.2 (7.3–9.9)8.8 (7.9–10.6)
Hemoglobin after transfusion (g/l)129 (111–153)132 (118–159)142 (127–171)
Haematocrit after transfusion0.35 (0.32–0.43)0.39 (0.34–0.46)0.40 (0.35–0.42)
Gestational age (weeks)27.0 (25–32)27.3 (25–34)26.6 (25–30)
Birth weight (g)1010 (730–1400)990 (605–2080)1000 (615–1840)
Male/female5/410/1114/3
Age (days) at transfusion27 (1–93)17 (2–75)13 (1–41)
Postmenstrual age (weeks)31.0 (26–39)31.3 (27–35)30.0 (26–34)
Intraventricular haemorrhage grade 1–2n=2n=1n=2
Intraventricular haemorrhage grade 3n=0n=1n=1
Conventional ventilationn=3n=7n=8
CPAP/nasal IMVn=3n=8n=7
No respiratory supportn=3n=6n=2
FiO2 >0.21n=3n=8n=6
Patency of the ductus arteriosusnonen=4n=3
Pco2 (kPa)5.8 (5.0–7.3)5.9 (4.1–7.8)6.0 (4.4–9.0)
Arterial blood pressure (mm Hg)41 (36–49)45 (31–66)41 (34–56)
  • Data are expressed as median (min–max) or as numbers.

  • There were no differences between groups (Mann–Whitney U test and χ2 test-for-trend, when appropriate).

  • CPAP, continuous positive airway pressure; FiO2, fractional inspired oxygen; IMV, intermittent mandatory ventilation.