Table 3

Hb levels in relation to birth order in monochorionic (MC) twin pairs delivered vaginally or through caesarean section (CS)

 Twin pairs delivered vaginally (n=171)Twin pairs delivered through CS (n=119)p Value
Twin 1Twin 2p ValueTwin 1Twin 2p Value
Hb level at birth—g/dL*†16.1±2.417.8±2.5<0.0115.9±2.216.3±2.50.10
Hb level on day 2—g/dL*‡14.8±2.718.0±3.0<0.0115.5±2.616.0±2.80.23
Hb difference at birth—g/dL*†1.9 (0.6–3.9)1.1 (0.4–3.1)0.02
Hb difference on day 2—g/dL*‡3.7 (2.7–6.3)2.4 (0.9–4.9)<0.01
Hb difference >8 g/dL at birth—n (%)†9 (5.2)0 (0.0)<0.01
Hb difference >8 g/dL on day 2—n (%)‡11 (6.4)0 (0.0)<0.01
  • *Values given as mean±SD or median (IQR).

  • †Hb levels at birth were available in 143 twin pairs delivered vaginally and in 115 twin pairs delivered through CS.

  • ‡Hb levels on day 2 were available in 91 twin pairs delivered vaginally and in 64 twin pairs delivered through CS.

  • Hb, haemoglobin.