According to Spanish government's estimates[1] based on their own seroprevalence study:
For the age group under 50, the estimated IFR is about 0.003%
For the age group 50 - 69 yo, it's 0.04%
And for those over 70, it's 4.1%
The study is considered to be well designed by Carl Bergstrom[2], for example.
[1]: https://www.mscbs.gob.es/profesionales/saludPublica/ccayes/a... Look for the table on page 15.
[2]: https://twitter.com/CT_Bergstrom/status/1261041466882678784
For the age group < 10 yo, the estimated IFR is 0.002%
For the age group 10 - 19 yo, the estimated IFR is 0.003%
For the age group 20 - 49 yo, the estimated IFR is 0.002%
For the age group 50 - 69 yo, the estimated IFR is 0.04%
For the age group > 70 yo, the estimated IFR is 4.1%
The study is considered to be well designed by Carl Bergstrom[2], for example.
[1]: https://www.mscbs.gob.es/profesionales/saludPublica/ccayes/a... Look for the table on page 15.
[2]: https://twitter.com/CT_Bergstrom/status/1261041466882678784