Age specific COVID-19 undercount in Spain from the regional breakdown of 52–week accumulated mortality rates

Spanish NUTS3 region records of age specific weekly deaths since the year 2020, records of age specific COVID–19 deaths and age specific population since the year 2020 are used to estimate first age specific all–cause death rates and age specific COVID–19 undercount.

Results shows a statistically significant impact of the pandemic in excess deaths for population aged 40 and elder. Statistically significant COVID–19 undercount is identified only for population aged 80 and elder. Very likely this is the result of the impact of the pandemic in institutionalized population at the early stages of the pandemic.