- A comparison of cohort excluded due to missing data, for workstream 1
- Estimation of differential travel time (excess travel time) to a neonatal intensive care unit (NICU)
- Missing data experiences using real world data in OPTI-PREM
- Definition and analysis of high vs low volume neonatal units
- RCPCH National Neonatal Audit Programme 2018 variables
- Mean (SE) level of care cost per baby (2018/19 UK £) for very preterm babies in England over the period 2014–18 using multiple imputation (n = 29,842)
- A comparison of gestational age at birth between very preterm births in the study cohort and those identified from national live births statistics for England for in 2016, 2017 and 2018
- Workstream 4 OPTI-PREM neonatal unit observation framework
- Acknowledgements: UK Neonatal Collaborative (as recorded at Neonatal Data Analysis unit)
- National Stakeholder meeting 22 April 2022: Comments and OPTI-PREM project team reflection on analysis and findings
- Protocol revision and major changes
Supplementary material can be found on the NIHR Journals Library report page (https://doi.org/10.3310/JYWC6538).
Supplementary material has been provided by the authors to support the report and any files provided at submission will have been seen by peer reviewers, but not extensively reviewed. Any supplementary material provided at a later stage in the process may not have been peer reviewed.