not OP but the point I believe is that while only portions of the population will be exposed to COVID over smaller time ranges like 4 months. Given that the dis

not OP but the point I believe is that while only portions of the population will be exposed to COVID over smaller time ranges like 4 months. Given that the disease is seemingly endemic, the probability of any individual person being exposed to it at any point in the future goes up so restricting it to 4 months includes those exposed and not exposed. To compare the relative risks, it might be more accurate to compare the risk of hospitalization for those individuals who have gotten a covid diagnosis versus those who have been vaccinated.