TABLE 4

Demographic Data for Twins in the Zygosity Analysis

VariableMonozygotic (n = 126)Dizygotic (n = 378)P
GA, wka29.67 ± 2.1529.72 ± 2.28.823
BW, ga1361.19 ± 447.261409.56 ± 441.42.293
Apgar score at 5 minb88.998
Male gender, n (%)62 (49.21)211 (55.82).216
RDS, n (%)80 (63.49)226 (59.79).528
IVH, n (%)17 (13.49)45 (11.90).637
NEC, n (%)10 (7.94)38 (10.05).600
BPD, n (%)30 (23.81)58 (15.34).041
Duration of ventilation, da7.32 ± 12.907.90 ± 17.53.690
Duration of supplemental O2, da27.29 ± 34.1521.55 ± 34.63.105
Length of stay, da53.75 ± 31.0046.86 ± 31.01.032
  • a Mean ± SD.

  • b IVH: rate was calculated as (16+39)/246, expressed as a precentage.