Henry Ford Health System, whose employees carried out the study, said it was deficient.

Dr. Marcus Zervos, an infectious disease specialist at the Henry Ford Health, and colleagues studied 18,468 children born between 2000 and 2016 who were enrolled in the health system's insurance plan, drawing data from medical, clinical, and payer records and supplementing with information from Michigan's immunization registry.

After 10 years, 57 percent of the vaccinated children had a chronic health condition such as asthma, compared to just 17 percent of the unvaccinated children.

"This study found that exposure to vaccination was independently associated with an overall 2.5-fold increase in the likelihood of developing a chronic health condition, when compared to children unexposed to vaccination," the authors wrote. "This association was primarily driven by asthma, atopic disease, eczema, autoimmune disease and neurodevelopmental disorders. This suggests that in certain children, exposure to vaccination may increase the likelihood of developing a chronic health condition, particularly for one of these conditions."

The study was first reported by Aaron Siri, managing partner of Siri & Glimstad LLP, this month in his book, Vaccines, Amen: The Religion of Vaccines.

Before receiving a copy of the study, The Epoch Times asked Zervos and his coauthors for it and questioned why it was never published.

Zervos responded to questions about the study by asking in an email, "Can you tell me what book this appeared in." When told, he did not respond further.

Co-authors did not return inquiries.

A spokesperson for Henry Ford Health acknowledged that researchers there carried out the study.

"This report was not published because it did not meet the rigorous scientific standards we demand as a premier medical research institution," a spokesperson for Henry Ford Health told The Epoch Times in an email. "Data has consistently shown vaccinations are a safe and effective way to protect children against potentially life-altering diseases."