Table 1

Algorithm for quality assurance of linkage of Office for National Statistics birth records to Hospital Episode Statistics birth records

Variable
StepHospital trust codeDate of birthSexBirth weightGestational ageMother’s date of birthPostcode
1EandEandEandEandE
2EandEandEand(EorE)
3EandEandEandE/MandE/M
4EandEandE/MandE/MandE/MandE/M
5EandPandEand(EorEorEorE)
6EandPE/MandE/MandE/MandE/M
  • E, exact match; M, missing; P, partial match (differs by up to 4 days, two elements of data match or dates match if day and month swapped).