I found this on the menu of the site, could be interesting:
It says:
General: Synthesis per status, synthesis per age
Vaccine efficacity: COVID cases, hospitalizations, intensive care, deaths
Simulations: Vaccination scenarios, individual probabilities
Other: PCR tests, non-symptomatic, Effects for 3rd dose
Source: Drees data from 31/5/2021 to 3/04/2022
(Drees is extremely reliable and one of the most cited in France)
The shown statistics are only the ones with a PCR positive test along with them.
Maybe this answers your questions.
I can't help but notice that you narrow your Covid stats down to 0-19, but leave your adverse vaccine incidence rates as general to all ages.
How about about comparing for us the fatality rate of 0-19 vaccinated vs. 0-19 unvaccinated, and breaking out serious adverse reaction rates for 0-19, and more importantly, death rates among 0-19 from adverse vaccine reactions? I suspect you don't have the latter two sets of data available due to some very fuzzy statistics around serious adverse reactions.
I find the notion of negative efficacy to be fairly dubious, which is probably why I have nopt seen this employed elsewhere . Consider, for example, that someone that decides to go unvaccinated is far more likely to also go unhospitalized once they do get sick. You statistics here only show the people that actually got treated and showed up in the stats...unless these stats include some fudge factor estimate to capture the unhospitalized.
As for the exchanges of the past couple of days, let's remember to discuss the facts, not to attack the posters. Posters may point out negatives...that arguments are illogical, tactics are being repeated, etc. but stay away from directly insulting anyone purely for who they are.
Negative efficacity is calculated and the result is negative because the percentage of unvaccinated people among the hospitalized is lower than the percentage of unvaccinated among the general population. It does not suggest that it's more likely to get hospitalized if you're vaccinated, because the people who got vaccinated were most likely more vulnerable in the first place and the unvaccinated were probably more restricted. However, that won't really considerably change the stats really, in a way where vaccine efficacity is considerable.
As for side-effects for 0-19 and the way that would change the stat:
" For example, younger people are said to experience higher intensity side-effects, in comparison to older ones."
https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/coronavirus-vaccine-how-side-effects-differ-in-younger-people-and-older-people-as-per-studies/photostory/84038767.cms?picid=84038881
It will only increase it.