Study of 55 million people adds further evidence that patients admitted to hospital at weekends have higher mortality

A systematic review and meta-analysis of hospital data worldwide, presented as this year's Euroanaesthesia meeting in Stockholm, adds further evidence that patients admitted to hospital at weekends have higher mortality than those admitted on weekdays. The study is by Dr Hiroshi Hoshijima, Tohoku University, Sendai, Japan, and colleagues.

The analysis included 72 studies from various world regions, covering 55,053,719 participants. The authors found that admission was associated with increased morality of between 15% and 17% depending on the statistical technique used.

Subgroup analysis revealed that patients admitted during the weekend were at a higher risk of death than weekday admission in patients in almost all categories. "There are at least two potential explanations for our results. First, these differences reflect poorer quality of care in hospital at the weekend, and second, patients admitted on at weekend could be more severely ill than those admitted on at weekday. We believe that poorer care at the weekends is the much more likely explanation."

The only exception to this trend was for the patients who underwent surgery, with the authors saying the lack of association between postoperative mortality and weekdays being potentially due to the few numbers of studies (just 4 studies) specifically examining postoperative mortality.

Furthermore, the authors say that, in some patients who underwent selected high risk procedures, these patients could received a substantial proportion of their postoperative care in critical care units that are more likely to provide the same type of service at all times during both weekdays and weekends. This would therefore dilute any effect of increased weekend mortality in these post-surgery patients.

The authors conclude: "Our shows that weekend admission is associated with higher compared with weekday ."

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