Table 4

Infants with iron status indicators outside reference limits at the age of 4 months according to umbilical cord clamping time

Umbilical cord clamping timeP value
10 s
(n=153 (HC))
60 s
(n=147)
180 s
(n=148 (HC))
60 s vs 10 s60 s vs 180 s
Ferritin <20 µg/L11 (7.2)4 (2.7)0 (0)0.110.06
Anaemia (haemoglobin <10.5 g/dL)20 (13.1)16 (11.4)20 (13.9)0.720.60
Mean cell volume <73 fL8 (5.2)14 (10.4)3 (2.1)0.120.01
Transferrin saturation <10%22 (14.4)15 (10.3)8 (5.4)0.380.13
Transferrin receptor >7 mg/L0 (0)2 (1.4)0 (0)0.240.25
Iron deficiency*8 (5.2)7 (4.8)1 (0.7)1.000.04
  • Values are unadjusted numbers (%).  *Defined as ≥ 2 iron indicators (low ferritin, low mean cell volume, low transferrin saturation, high transferrin receptor) outside reference range.

  • Numbers of successful analyses: mean cell volume (n=153, 135, 144), transferrin saturation (n=153, 145, 148), anaemia (n=153, 140, 144).

  • HC, historical  cohort.