ArticlePloS one2022
Fetal size classified using gestational days rather than gestational weeks improves correlation with stillbirth risk: A statewide population study.
Article in PloS one, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 4 citations in OpenAlex.
- Neurodevelopment in small-for-gestational-age preterm infants: distinguishing the impact of birthweight and gestational age in a cohort study.Journal of perinatology : official journal of the California Perinatal Association · 2026Article
- Stillbirth risk by fetal size among 126.5 million births in 15 countries from 2000 to 2020: A fetuses-at-risk approach.BJOG : an international journal of obstetrics and gynaecology · 2025Article
- Care of neonates following in-utero growth restriction: A prospective cohort study exploring neonatal morbidity.Journal of perinatology : official journal of the California Perinatal Association · 2025Article
- The Fetal Region-specific Optimized Growth Standard (FROGS)-A fetal and birthweight centile calculator validated in a national population.PLoS medicine · 2025Article
- Slowing fetal growth velocity from the mid-trimester may signal increased risks of perinatal morbidity and mortality: a retrospective cohort study.BMC medicine · 2025Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveMany growth charts provide single centile cutoffs for each week of gestation, yet fetuses gain weight throughout the week. We aimed to assess whether using a single centile per week distorts the proportion of infants classified as small and their risk of stillbirth across the week.
designRetrospective cohort study.
settingVictoria, Australia. POPULATION: Singleton, non-anomalous infants born from 2005-2015 (529,261).
methodsWe applied growth charts to identify small-for-gestational-age (SGA) fetuses on week-based charts (single centile per gestational week) and day-based charts (centile per gestational day).
main outcome measuresProportions <10th centile by each chart, and stillbirth risk amongst SGA infants.
resultsUsing week-based charts, 12.1% of infants born on the first day of a gestational week were SGA, but only 7.8% on the final day; ie. an infant born at the end of the week was 44% less likely to be classed as SGA (p<0.0001). The relative risk of stillbirth amongst SGA infants born on the final day of the week compared with the first was 1.47 (95%CI 1.09-2.00, p = 0.01). Using day charts, SGA proportions were similar and stillbirth risk equal between the beginning and end of the week (9.5% vs 9.9%).
conclusionsGrowth standards using a single cutoff for a gestational week overestimate the proportion of infants that are small at the beginning of the week and underestimate the proportion at the end. This distorts the risk of stillbirth amongst SGA infants based on when in the week an infant is born. Day-based charts should be used.
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