"COVID-19 daily hospitalization data indicates that the large growth in hospitalizations in Michigan in March is occurring among younger age groups that have the lowest vaccination rates among the state population, according to inpatient data collected by the Michigan Health & Hospital Association (MHA).
From March 1 to March 23, hospitalizations increased by 633% for adults ages 30-39 and by 800% for adults ages 40-49. Hospitalization growth rates decline as the vaccination rates per age group increases, with hospitalizations increasing by just 37% for adults 80 or older, of which 44% of the population are fully vaccinated in the state. The correlation between high vaccination rates and lower hospitalization growth rates shows the effectiveness of the COVID-19 vaccine and how it protects from the risk of severe disease or hospitalization. The data also indicates that, although older adults still have a higher risk of hospitalizations, the percentage of hospitalized patients who are younger than 40 years old has doubled, showing that adults of any age are vulnerable to complications from the disease."