Improving outcomes for very preterm babies in England: does place of birth matter? Findings from OPTI-PREM, a national cohort study.

Objective: Babies born between 27 and 31 weeks of gestation contribute substantially towards infant mortality and morbidity. In England, their care is delivered in maternity services colocated with highly specialised neonatal intensive care units (NICU) or less specialised local neonatal units (LNU). We investigated whether birth setting offered survival and/or morbidity advantages to inform National Health Service delivery.

Recommendations for data collection in cohort studies of preterm born individuals - The RECAP Preterm Core Dataset.

Background: Preterm birth (before 37 completed weeks of gestation) is associated with an increased risk of adverse health and developmental outcomes relative to birth at term. Existing guidelines for data collection in cohort studies of individuals born preterm are either limited in scope, have not been developed using formal consensus methodology, or did not involve a range of stakeholders in their development. Recommendations meeting these criteria would facilitate data pooling and harmonisation across studies.

Estimated neonatal survival of very preterm births across the care pathway: a UK cohort 2016-2020.

Objective: Currently used estimates of survival are nearly 10 years old and relate to only those babies admitted for neonatal care. Due to ongoing improvements in neonatal care, here we update estimates of survival for singleton and multiple births at 22 to 31 weeks gestational age across the perinatal care pathway by gestational age and birth weight.

Design: Retrospective analysis of routinely collected data.

Methods for Constructing Normalised Reference Scores: An Application for Assessing Child Development at 24 Months of Age.

The use of the lambda-mu-sigma (LMS) method for estimating centiles and producing reference ranges has received much interest in clinical practice, especially for assessing growth in childhood. However, this method may not be directly applicable where measures are based on a score calculated from question response categories that is bounded within finite intervals, for example, in psychometrics. In such cases, the main assumption of normality of the conditional distribution of the transformed response measurement is violated due to the presence of ceiling (and floor) effects, leading to biased fitted centiles when derived using the common LMS method.

Understanding ethnic inequalities in stillbirth rates: a UK population-based cohort study.

Objectives: To investigate inequalities in stillbirth rates by ethnicity to facilitate development of initiatives to target those at highest risk.

Design: Population-based perinatal mortality surveillance linked to national birth and death registration (Mothers and Babies: Reducing Risk through Audits and Confidential Enquiries across the UK).

Setting: UK.