Please use this identifier to cite or link to this item:
Title: Magnitude and modifiers of the weekend effect in hospital admissions: a systematic review and meta-analysis.
Authors: Chen, Y-F
Armoiry, X
Higenbottam, C
Cowley, N
Basra, R
Watson, SI
Tarrant, C
Boyal, A
Sutton, E
Wu, C-W
Aldridge, CP
Gosling, A
Lilford, R
Bion, J
First Published: 4-Jun-2019
Publisher: BMJ Publishing Group
Citation: BMJ Open, 2019, 9:e025764
Abstract: OBJECTIVE: To examine the magnitude of the weekend effect, defined as differences in patient outcomes between weekend and weekday hospital admissions, and factors influencing it. DESIGN: A systematic review incorporating Bayesian meta-analyses and meta-regression. DATA SOURCES: We searched seven databases including MEDLINE and EMBASE from January 2000 to April 2015, and updated the MEDLINE search up to November 2017. Eligibility criteria: primary research studies published in peer-reviewed journals of unselected admissions (not focusing on specific conditions) investigating the weekend effect on mortality, adverse events, length of hospital stay (LoS) or patient satisfaction. RESULTS: For the systematic review, we included 68 studies (70 articles) covering over 640 million admissions. Of these, two-thirds were conducted in the UK (n=24) or USA (n=22). The pooled odds ratio (OR) for weekend mortality effect across admission types was 1.16 (95% credible interval 1.10 to 1.23). The weekend effect appeared greater for elective (1.70, 1.08 to 2.52) than emergency (1.11, 1.06 to 1.16) or maternity (1.06, 0.89 to 1.29) admissions. Further examination of the literature shows that these estimates are influenced by methodological, clinical and service factors: at weekends, fewer patients are admitted to hospital, those who are admitted are more severely ill and there are differences in care pathways before and after admission. Evidence regarding the weekend effect on adverse events and LoS is weak and inconsistent, and that on patient satisfaction is sparse. The overall quality of evidence for inferring weekend/weekday difference in hospital care quality from the observed weekend effect was rated as 'very low' based on the Grading of Recommendations, Assessment, Development and Evaluations framework. CONCLUSIONS: The weekend effect is unlikely to have a single cause, or to be a reliable indicator of care quality at weekends. Further work should focus on underlying mechanisms and examine care processes in both hospital and community. PROSPERO REGISTRATION NUMBER: CRD42016036487.
DOI Link: 10.1136/bmjopen-2018-025764
eISSN: 2044-6055
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2019. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Health Sciences

Files in This Item:
File Description SizeFormat 
e025764.full.pdfPublished (publisher PDF)2.16 MBAdobe PDFView/Open

Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.