The study was conducted in 2020 by researchers at Henry Ford Health, a health care network in Detroit and southeast Michigan. I can say definitively that the study by Henry Ford Health researchers has serious design problems that keep it from revealing much about whether vaccines affect children’s long-term health. Study participants and conclusionsThe researchers examined the medical records of about 18,500 children born between 2000 and 2016 within the Henry Ford Health network. In the Henry Ford system, vaccinated kids averaged about seven visits per year, while unvaccinated kids had only about two. They also change how often families visit Henry Ford clinics, which affects what shows up in the records.