Evidence map›Paper›PMID 29440158›Full record

ArticleBMJ open2018

Risk factors and between-hospital variation of caesarean section in Denmark: a cohort study.

Sonja Wehberg, Rikke Guldberg, Kim Oren Gradel, Ulrik Schiøler Kesmodel, Lis Munk, Charlotte Brix Andersson, Line Riis Jølving, Jan Nielsen, Bente Mertz Nørgård

Abstract readMulticenter Study
In one paragraph

Article in BMJ open, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.

0numbers the graph read from it
0cells of the map it votes in
8citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

8 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Sonja WehbergCenter for Clinical Epidemiology, Odense University Hospital, Odense, Denmark.
Rikke GuldbergCenter for Clinical Epidemiology, Odense University Hospital, Odense, Denmark.
Kim Oren GradelCenter for Clinical Epidemiology, Odense University Hospital, Odense, Denmark.
Ulrik Schiøler KesmodelDepartment of Obstetrics and Gynecology, Herlev University Hospital, Herlev, Denmark.
Lis MunkSwedish Association for Health Professionals, Stockholm, Sweden.
Charlotte Brix AnderssonDepartment of Obstetrics and Gynecology, Aalborg University Hospital, Aalborg, Denmark.
Line Riis JølvingCenter for Clinical Epidemiology, Odense University Hospital, Odense, Denmark.
Jan NielsenCenter for Clinical Epidemiology, Odense University Hospital, Odense, Denmark.
Bente Mertz NørgårdCenter for Clinical Epidemiology, Odense University Hospital, Odense, Denmark.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesThe aim of this study was to estimate the effects of risk factors on elective and emergency caesarean section (CS) and to estimate the between-hospital variation of risk-adjusted CS proportions.

designHistorical registry-based cohort study. SETTINGS AND

participantsThe study was based on all singleton deliveries in hospital units in Denmark from January 2009 to December 2012. A total of 226 612 births by 198 590 mothers in 29 maternity units were included. PRIMARY AND SECONDARY OUTCOME MEASURES: We estimated (1) OR of elective and emergency CS adjusted for several risk factors, for example, body mass index, parity, age and size of maternity unit and (2) risk-adjusted proportions of elective and emergency CS to evaluate between-hospital variation.

resultsThe CS proportion was stable at 20%-21%, but showed wide variation between units, even in adjusted models. Large units performed significantly more elective CSs than smaller units, and the risk of emergency CS was significantly reduced compared with smaller units. Many of the included risk factors were found to influence the risk of CS. The most important risk factors were breech presentation and previous CS. Four units performed more CSs and one unit fewer CSs than expected.

conclusionThe main risk factors for elective CS were breech presentation and previous CS; for emergency CS they were breech presentation and cephalopelvic disproportion. The proportions of CS were stable during the study period. We found variation in risk-adjusted CS between hospitals in Denmark. Although exhaustive models were applied, the results indicated the presence of systematic variation between hospital units, which was unexpected in a small, well-regulated country such as Denmark.

Indexed as

AdolescentAdultBreech PresentationCesarean SectionCohort StudiesDenmarkElective Surgical ProceduresEmergenciesFemaleHospitalsHumansLogistic ModelsMultivariate AnalysisParityPregnancyRegistriesepidemiologyobstetricsquality in health care

Identifiers

PMID29440158
PMCPMC5829888

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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.