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.
I'm not sure that is true. As I understand it, it's a cohort of people of that age who live in a geographical area of Israel where vaccination was started early. So it includes people of that age who declined the vaccine/didn't get it fr other reasons.
Of course, you're also correct that another important factor is that some of the cohort are not yet fully protected.
Quote:
In order to distill the possible effect of the vaccinations from other factors, including a third lockdown imposed in Israel on January 2021, we compared the time-dependent changes in number of COVID-19 cases and hospitalizations between (1) individuals aged 60 years and older, eligible to receive the vaccine earlier and younger individuals (0-59 years old); (2) early-vaccinated cities compared to late-vaccinated cities; (3) early-vaccinated geographical statistical areas (GSAs) compared to late-vaccinated GSAs;
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/10.1101/2021.02.08.21251325v...
Apologies for original error.