↑Data on new deaths is compiled by the Public Health Agency of Sweden at 11:30 CEST (UTC+02:00) each day from the communicable disease surveillance system SmiNet. Reports of new deaths to the Public Health Agency might be delayed by up to several days, especially around weekends, possibly introducing delays in reported number of cases for the last few days. In mid-April, approximately 30% of the cases were reported within 24 hours, 50% within 48 hours, and 90% within one week. Data from the Health Agency includes all deaths where a COVID-19 diagnosis had been confirmed (U07.1) during the past 30 days, including cases where the cause of death was not attributed to COVID-19 (as of data from the National Board of Health and Welfare from 21 April, this number amounted to 4.5% of cases confirmed in a laboratory), but excludes non-confirmed cases (U07.2). On 12 May 87% of the deaths attributed to COVID-19 were not confirmed in a laboratory. As this only includes cases confirmed in a laboratory, the actual number is believed to be higher due to the number of laboratory-confirmed cases only amounting to 83% (as of 31 May) of an excess mortality observed in Sweden since late March, according to a statistical analysis by the Public Health Agency based on data from the Swedish Tax Agency and the European mortality monitoring activity (EuroMOMO). By late May, there had been approximately 4,800 excess deaths in Sweden.[۲][۳][۴]