Actually, I was wrong. I checked the source paper. I believe the labels refer to cohorts from cities that were early in the vaccination campaign vs cohorts from

Actually, I was wrong. I checked the source paper. I believe the labels refer to cohorts from cities that were early in the vaccination campaign vs cohorts from cities that were late in the campaign. So 0-59 late vaccinated means some vaccines but later in time and fewer in number. This is what I gathered from the abstract anyway: https://www.medrxiv.org/content/10.1101/2021.02.08.21251325v1 https://www.medrxiv.org/content/10.1101/2021.02.08.21251325v... Apologies for original error.