• BMJ quality & safety · Mar 2019

    Sicker patients account for the weekend mortality effect among adult emergency admissions to a large hospital trust.

    • Jianxia Sun, Alan J Girling, Cassie Aldridge, Felicity Evison, Chris Beet, Amunpreet Boyal, Gavin Rudge, Richard J Lilford, and Julian Bion.
    • Health Informatics, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
    • BMJ Qual Saf. 2019 Mar 1; 28 (3): 223-230.

    ObjectiveTo determine whether the higher weekend admission mortality risk is attributable to increased severity of illness.DesignRetrospective analysis of 4 years weekend and weekday adult emergency admissions to a university teaching hospital in England.Outcome Measures30-day postadmission weekend:weekday mortality ratios adjusted for severity of illness (baseline National Early Warning Score (NEWS)), routes of admission to hospital, transfer to the intensive care unit (ICU) and demographics.ResultsDespite similar emergency department daily attendance rates, fewer patients were admitted on weekends (mean admission rate 91/day vs 120/day) because of fewer general practitioner referrals. Weekend admissions were sicker than weekday (mean NEWS 1.8 vs 1.7, p=0.008), more likely to undergo transfer to ICU within 24 hours (4.2% vs 3.0%), spent longer in hospital (median 3 days vs 2 days) and less likely to experience same-day discharge (17.2% vs 21.9%) (all p values <0.001).The crude 30-day postadmission mortality ratio for weekend admission (OR=1.13; 95% CI 1.08 to 1.19) was attenuated using standard adjustment (OR=1.11; 95% CI 1.05 to 1.17). In patients for whom NEWS values were available (90%), the crude OR (1.07; 95% CI 1.01 to 1.13) was not affected with standard adjustment. Adjustment using NEWS alone nullified the weekend effect (OR=1.02; 0.96-1.08).NEWS completion rates were higher on weekends (91.7%) than weekdays (89.5%). Missing NEWS was associated with direct transfer to intensive care bypassing electronic data capture. Missing NEWS in non-ICU weekend patients was associated with a higher mortality and fewer same-day discharges than weekdays.ConclusionsPatients admitted to hospital on weekends are sicker than those admitted on weekdays. The cause of the weekend effect may lie in community services.© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY. Published by BMJ.

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