Table 1

Sociodemographic and clinical characteristics of mothers and babies born at ≤30 weeks’ gestation in NPP maternity units in England, October 2017–June 2020

VariablePre-implementation*Post implementation*
Sociodemographic characteristics of babies†
 Babies (n)36303441
 Gestational age (weeks), median (IQR)27.9 (25.9–29.0)27.9 (26.0–29.1)
 Birth weight (g), median (IQR)982 (770–1210)980 (769–1205)
 Birth weight adjusted for gestational age (z-score), median (IQR)0.1 (−0.6 to 0.7)0.1 (−0.6 to 0.7)
 Male sex, n (%)1960 (54.0)1851 (53.8)
 Multiple births, n (%)871 (24.0)817 (23.7)
Sociodemographic and clinical characteristics of mothers
 Mothers (n)31893016
 Maternal age (years), mean (SD)31 (6)31 (6)
 White ethnicity, n (%)1711 (60.2)1610 (61.2)
 Level of deprivation (IMD quintile), n (%)
 1 (most deprived)1108 (31.0)1112 (32.9)
 2912 (25.6)773 (22.9)
 3643 (18.0)621 (18.4)
 4485 (14.0)454 (13.4)
 5 (least deprived)422 (11.82)418 (12.4)
 Hypertension in pregnancy, n (%)128 (3.5)157 (4.6)
 Antenatal steroids given, n (%)3340 (92.1)3220 (93.9)
Maternity unit characteristics
 Special care unit/high dependency unit, n (%)1336 (36)1226 (35.6)
 Neonatal intensive care unit, n (%)2294 (63.2)2215 (64.4)
 Average number of eligible births per hospital per month, mean (SD)2.9 (2.1)2.9 (2.1)
  • *Figures cover the 12 months prior to, and 12 months following the recorded NPP adoption date at each unit, excluding the month of adoption itself.

  • †All babies in the dataset including multiples

  • IMD, Index of Multiple Deprivation; NPP, National PReCePT Programme; PReCePT, Preventing Cerebral Palsy in Pre Term labour.