ArticleInternational journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics2019
Quantifying bias between reported last menstrual period and ultrasonography estimates of gestational age in Lusaka, Zambia.
Article in International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 1 of them a synthesis that pooled it.
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Who cites it
19 citing papers in PubMed, 1 synthesis or guideline pooled it, 30 citations in OpenAlex.
- Influence of different methods for calculating gestational age at birth on prematurity and small for gestational age proportions: a systematic review with meta-analysis.BMC pregnancy and childbirth · 2023Pooled it
- Association between HIV antiretroviral therapy and preterm birth based on antenatal ultrasound gestational age determination: a comparative analysis.AIDS (London, England) · 2019Trial
- Prevalence and factors associated with small for gestational age births among women delivering at a tertiary hospital in South-Western Uganda: a cross-sectional study.BMC pregnancy and childbirth · 2025Article
- Observational
- Deep learning to estimate gestational age from fly-to cineloop videos: A novel approach to ultrasound quality control.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2024Article
- Problems with gestational age estimation by last menstrual period and ultrasound among late antenatal care attendant women in a low-resource setting in Africa, Sudan.Journal of ultrasound · 2024Article
- Lower accuracy of estimated delivery date using last menstrual period recall and related factors of adverse events during childbirth: A sub-analysis of a birth cohort study in Makassar, Indonesia.Belitung nursing journal · 2024Article
- Clinical and population-based study design considerations to accelerate the investigation of new antiretrovirals during pregnancy.Journal of the International AIDS Society · 2022Article
- Surveillance of ARV safety in pregnancy and breastfeeding: towards a new framework.Journal of the International AIDS Society · 2022Article
- AI Estimation of Gestational Age from Blind Ultrasound Sweeps in Low-Resource Settings.NEJM evidence · 2022Article
- Population attributable fractions for risk factors for spontaneous preterm births in 81 low- and middle-income countries: A systematic analysis.Journal of global health · 2022Review
- Circulating angiogenic factors and HIV among pregnant women in Zambia: a nested case-control study.BMC pregnancy and childbirth · 2021Article
- Reliability of last menstrual period recall, an early ultrasound and a Smartphone App in predicting date of delivery and classification of preterm and post-term births.BMC pregnancy and childbirth · 2021Article
- Comparison of first trimester dating methods for gestational age estimation and their implication on preterm birth classification in a North Indian cohort.BMC pregnancy and childbirth · 2021Observational
- Methodological Considerations for Preterm Birth Research.Frontiers in global women's health · 2021Article
- Vaginal progesterone to prevent preterm delivery among HIV-infected pregnant women in Zambia: A feasibility study.PloS one · 2020Article
- Intramuscular 17-hydroxyprogesterone caproate to prevent preterm birth among HIV-infected women in Zambia: study protocol of the IPOP randomized trial.BMC pregnancy and childbirth · 2019Article
- Adverse birth outcomes and their clinical phenotypes in an urban Zambian cohort.Gates open research · 2019Article
- The Zambian Preterm Birth Prevention Study (ZAPPS): Cohort characteristics at enrollment.Gates open research · 2018Article
Corrections and comments
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Authors and funding
8 authors at 3 institutions in 2 countries.
Funding
Abstract
objectiveTo quantify differences in assessing preterm delivery when calculating gestational age from last menstrual period (LMP) versus ultrasonography biometry.
methodsThe Zambian Preterm Birth Prevention Study is an ongoing prospective cohort study that commenced enrolment in August 2015 at Women and Newborn Hospital of University Teaching Hospital in Lusaka, Zambia. Women at less than 20 weeks of pregnancy who were enrolled between August 17, 2015, and August 31, 2017, and underwent ultrasonography examination were included in the present analysis. The primary outcome was the difference between ultrasonography- and LMP-based estimated gestational age. Associations between baseline predictors and outcomes were assessed using simple regression. The proportion of preterm deliveries using LMP- and ultrasonography-derived gestational dating was calculated using Kaplan-Meier analysis.
resultsThe analysis included 942 women. The discrepancy between estimating gestational age using ultrasonography and LMP increased with greater gestational age at presentation and among patients with no history of preterm delivery. In a Kaplan-Meier analysis of 692 deliveries, 140 (20.2%, 95% confidence interval [CI] 17.7-23.0) and 79 (11.4%, 95% CI 9.6-13.6) deliveries were classified as preterm by LMP and ultrasonography estimates, respectively.
conclusionTaking ultrasonography as a standard, a bias was observed in LMP-based gestational age estimates, which increased with advancing gestation at presentation. This resulted in misclassification of term deliveries as preterm.
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