Table 3

Effect on mortality of increasing time from patient arrival to inpatient bed transfer as shown by the standardised mortality ratio and number needed to harm

Hours in the EDSMRPercentage change in the SMR95% lower confidence limit for the SMR95% upper confidence limit for the SMRAdjusted absolute mortality rateNumber needed to harm
(30-day mortality)
Up to 4 hours0.94−6%0.920.958.2%−191
4–6 hours1.066%
6–8 hours1.1414%
8–12 hours1.1616%1.121.2110.1%72
  • ED, emergency department; vW, summary score developed by van Walraven.18