Availability of data by birth data set
| Fields of information | HES deliveries | HES births | ONS births | NN4B |
|---|---|---|---|---|
| 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.