Related Experiment Video
Updated: Jan 6, 2026

Inverse Probability of Treatment Weighting Propensity Score using the Military Health System Data Repository and National Death Index
Published on: January 8, 2020
Association between elevated weekend mortality and the seven-day hospital services programme in England: A
Charlotte Underwood1, Matt Sutton1, Rachel Meacock1
1The University of Manchester, UK.
Background:
Patients admitted to hospital at weekends experience higher mortality rates than those admitted during the week. The NHS in England has taken the lead internationally with attempts to tackle this issue. Four priority clinical standards for emergency care have been introduced with the aim of reducing the 'weekend effect'. We investigate whether implementation of this policy has been associated with changes in the weekend effect.
Methods:
Retrospective observational study of 120 hospital Trusts in England. We use data on Trusts' performance against the clinical standards in 2015 and 2017, and estimates of Trusts' weekend effects in risk-adjusted mortality in financial years 2015/16 and 2016/17. We examine whether adoption of the standards is associated with the weekend effect.
Results:
We detect little association between Trusts' mortality weekend effects in 2016/17 and their performance against the clinical standards in 2017. Changes in achievement of the standards between 2015 and 2017 were not associated with changes in the weekend effect between 2015/16 and 2016/17.
Discussion:
Large improvements in performance against all four standards have not translated into reductions in the weekend effect. We find no evidence that England's policy is a beneficial way for health systems to respond to this phenomenon. Given the failure of the policy to achieve its aim, the current mandate for full compliance by 2020 requires urgent review.
Related Concept Videos
Assumptions of Survival Analysis
Comparing the Survival Analysis of Two or More Groups
Introduction To Survival Analysis
The primary goal of survival analysis is to estimate survival time—the time...
Actuarial Approach
Consider the example of a high-risk surgical procedure with significant early-stage mortality. A two-year clinical study is conducted,...
Introduction to Epidemiology
Kaplan-Meier Approach
