Table 3

Outcome measures at the age of 4 months adjusted for infant age

Umbilical cord clamping time (adjusted means (95% CI))P value
10 s
(n=152 (HC))
60 s
(n=147)
180 s
(n=148 (HC))
60 s vs 10 s60 s vs 180 s
Main outcome measures
 Geometricmean (range) ferritin (μg/L)77 (68 to 87)103 (90 to 117)114 (100 to 129)0.0020.29
 Haemoglobin (g/dL)11.3 (11.2 to 11.5)11.4 (11.3 to 11.6)11.3 (11.2 to 11.4)0.300.17
Blood count
 Haematocrit (%)33.1 (32.7 to 33.4)33.1 (32.8 to 33.5)32.7 (32.4 to 33.1)0.300.12
 Mean cell volume (fL)77.8 (77.3 to 78.3)77.9 (77.3 to 78.4)79.1 (78.6 to 79.6)0.300.003
 Reticulocyte count (×1012/L)0.037 (0.035 to 0.039)0.037 (0.035 to 0.039)0.039 (0.038 to 0.041)0.990.07
Iron status
 Transferrin receptor (mg/L)4.01 (3.87 to 4.14)4.05 (3.92 to 4.19)3.72 (3.59 to 3.85)0.620.001
 Transferrin saturation (%)15.7 (14.7 to 16.7)16.6 (15.5 to 17.7)18.1 (17 to 19.2)0.250.06
  • Values are means (95% CI) adjusted for infant age (days from birth) unless stated otherwise.

  • Successful analyses for the 60 s group: ferritin (n=147), haemoglobin (n=140), haematocrit, mean cell volume, reticulocyte count (n=135), transferrin receptor and transferrin saturation (n=145). For the 180 s group, blood status (n=144).

  • HC, historical  cohort.