Table 1

Baseline characteristics of infants included in phase IV randomised controlled trial of two schedules of a four-component meningococcal B vaccine in UK preterm infants

CharacteristicNGroup 1 (2+1 schedule)NGroup 2 (3+1 schedule)
Gestational age
Median (range)
6430+2 (23+0–34+3)6530+2 (24+2–34+3)
Ethnicity (white)
N (%)
6452 (81.3)6557 (87.7)
Sex (female)
N (%)
6432 (50)6541 (63.1)
Birth weight (g)
Median (range)
641262.5 (575–2790)651350 (490–2610)
CLD
N (%)
6417 (26.6)6515 (23.1)
SGA
N (%)
645 (7.8)6510 (15.4)
Blood transfusion
N (%)
6425 (39.1)6527 (41.5)
Antenatal steroids
N (%)
6459 (92.2)6563 (96.9)
Postnatal steroids
N (%)
645 (7.8)652 (3.1)
  • CLD, chronic lung disease (supplementary oxygen±mechanical ventilation at >28 days of life and at a corrected gestational age of >36 weeks of gestation); SGA, small for gestational age (<10th percentile for gestational age at birth).