Selection bias in estimating the relationship between prolonged ED boarding and mortality in emergency critical care patients.

When downgrades were excluded, the mortality in the prolonged boarding group increased to 17.4%, 1.5% lower than the mortality in non‐prolonged boarding group, although this did not reach statistical significance (risk difference ‐1.5%, 95% CI ‐6.2% to 3.2%, P = 0.5720) (Table 2B ).

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