A retrospective review of medical records (2017-2018) at Linköping University Hospital compared hospital mortality for the 2-month period of summer vacations (group A) with two months of regular activity (group B). The mortality was 163 patients in group A and 216 in group B. Emergency admittance dominated (95%) in both groups. Comorbidity was found in 81%, and at admittance the risk for death during the hospital stay was estimated to more than 50% in three out of four patients. There was no difference between the groups regarding demography, hospital stay, or diagnosis. Due to a 30% reduction of hospital beds during the summer some patients were relocated to other specialties. No relocated patient died in group A but six in group B. Eight deaths were judged as probably preventable, but none definitely preventable. The similarity between the groups regarding mortality does not allow estimations of differences in adverse events in general. Low mortality among relocated patients is probably due to identification of high-risk patients not suitable for relocation.

Mortaliteten på Universitetssjukhuset i Linköping ökade inte under sommaren (1,5 procent) jämfört med under våren (1,6 procent).

Mer än 9 av 10 patienter lades in oplanerat. 

De flesta (75–77 procent) hade dåligt allmäntillstånd vid ankomsten.

Patienternas samsjuklighet var hög (81 procent) under såväl sommar som vår.

Ingen utlokaliserad patient avled under sommaren, däremot avled 6 patienter under våren.

Ingen av patienterna hade en uppenbart undvikbar dödsorsak. Däremot var dödsorsaken sannolikt undvikbar hos 8 patienter under både våren och sommaren.