Table 1

Availability of data by birth data set

Fields of informationHES deliveriesHES birthsONS birthsNN4B
Birth status
Birth weight
Sex of baby
Mother’s date of birth**
Residential postcode
Residential address
Gestational age (still)
Gestational age (live)
Ethnicity of mother
Ethnicity of baby
Previous pregnancies
Previous children
Delivery method
Delivery place
  • *Although mother’s date of birth is recorded in the ONS births data set to comply with legislation on disclosure Small Area Health Statistics Unit (SAHSU) researchers are only provided with 2-year maternal age bands.

  • HES, Hospital Episode Statistics; ONS, Office for National Statistics; NN4B, NHS Numbers for Babies.