ArticleAmerican journal of obstetrics and gynecology2015
The impact of hospital obstetric volume on maternal outcomes in term, non-low-birthweight pregnancies.
Article in American journal of obstetrics and gynecology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
25 citing papers in PubMed.
- Causes and risk factors for singleton stillbirth in Japan: Analysis of a nationwide perinatal database, 2013-2014.Scientific reports · 2018Trial
- Estimating the incidence and risk factors of postpartum hemorrhage from the national ENACT network.npj health systems · 2026Article
- The Association of Hospital Characteristics with Brachial Plexus Birth Injury.Research square · 2026Article
- Hospital birth volume and rurality: Associations with pregnancy outcomes among individuals with chronic hypertension.Pregnancy (Hoboken, N.J.) · 2025Article
- Obstetric Outcomes by Hospital Volume of Operative Vaginal Delivery.JAMA network open · 2025Article
- Hospital obstetric volume and maternal outcomes: Does hospital size matter?Acta obstetricia et gynecologica Scandinavica · 2025Article
- The implications of using maternity care deserts to measure progress in access to obstetric care: a mixed-integer optimization analysis.BMC health services research · 2024Article
- Intrapartum Quality of Care among Healthy Women: A Population-Based Cohort Study in an Italian Region.International journal of environmental research and public health · 2024Article
- Metrics for maternity unit staffing in low resource settings: Scoping review and proposed core indicator.Frontiers in global women's health · 2023Article
- Severe maternal morbidity and other perinatal complications among women with physical, sensory, or intellectual and developmental disabilities.Paediatric and perinatal epidemiology · 2022Article
- The causal effect of delivery volume on severe maternal morbidity: an instrumental variable analysis in Sichuan, China.BMJ global health · 2022Article
- Promptness of oxytocin administration for first-line treatment of postpartum hemorrhage: a national vignette-based study among midwives.BMC pregnancy and childbirth · 2022Article
- Correlates of Receiving Guideline-Concordant Postpartum Health Services in the Community Health Center Setting.Women's health reports (New Rochelle, N.Y.) · 2022Article
- Birth Volume and Geographic Distribution of US Hospitals With Obstetric Services From 2010 to 2018.JAMA network open · 2021Article
- Busy day effect on intrapartum adverse maternal outcomes - a population-based study of 601 247 singleton deliveries.BMC pregnancy and childbirth · 2021Article
- Trends in comorbidity, acuity, and maternal risk associated with preeclampsia across obstetric volume settings.The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians · 2019Article
- The Association between Maternal Height, Body Mass Index, and Perinatal Outcomes.American journal of perinatology · 2019Article
- Risk for postpartum hemorrhage, transfusion, and hemorrhage-related morbidity at low, moderate, and high volume hospitals.The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians · 2018Article
- A 'busy day' effect on perinatal complications of delivery on weekends: a retrospective cohort study.BMJ quality & safety · 2017Article
- Hospital delivery volume, severe obstetrical morbidity, and failure to rescue.American journal of obstetrics and gynecology · 2016Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
Abstract
objectiveThe impact of hospital obstetric volume specifically on maternal outcomes remains under studied. We examined the impact of hospital obstetric volume on maternal outcomes in low-risk women who delivered non-low-birthweight infants at term. STUDY
designWe conducted a retrospective cohort study of term singleton, non-low-birthweight live births from 2007-2008 in California. Deliveries were categorized by hospital obstetric volume categories and separately for nonrural hospitals (category 1: 50-1199 deliveries per year; category 2: 1200-2399; category 3: 2400-3599, and category 4: ≥3600) and rural hospitals (category R1: 50-599 births per year; category R2: 600-1699; category R3: ≥1700). Maternal outcomes were compared with the use of the chi-square test and multivariable logistic regression.
resultsThere were 736,643 births in 267 hospitals that met study criteria. After adjustment for confounders, there were higher rates of postpartum hemorrhage in the lowest-volume rural hospitals (category R1 adjusted odds ratio, 3.06; 95% confidence interval, 1.51-6.23). Rates of chorioamnionitis, endometritis, severe perineal lacerations, and wound infection did not differ between volume categories. Longer lengths of stay were observed after maternal complications (eg, chorioamnionitis) in the lowest-volume hospitals (16.9% prolonged length of stay in category 1 hospitals vs 10.5% in category 4 hospitals; adjusted odds ratio, 1.91; 95% confidence interval, 1.01-3.61).
conclusionAfter confounder adjustment, few maternal outcomes differed by hospital obstetric volume. However, elevated odds of postpartum hemorrhage in low-volume rural hospitals raises the possibility that maternal outcomes may differ by hospital volume and geography. Further research is needed on maternal outcomes in hospitals of different obstetric volumes.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.