Lack of health insurance coverage is killing Americans.

That is the conclusion of a review of studies published Tuesday by the Annals of Internal Medicine that found health insurance coverage correlates to better chances for survival. Having health insurance reduces mortality rates among adults between 18 and 64 years old by between 3 percent and 29 percent, the study found.

Having health insurance coverage means that conditions like diabetes, cancer and high blood pressure are diagnosed and treated earlier, leading to lower mortality rates, according to the study review.

The researchers, Dr. Steffie Woolhandler and Dr. David Himmelstein, are both professors at the City University of New York’s Hunter College, and are also affiliated with Physicians for a National Health Program, an organization advocating for single-payer health care.

The study found that individuals with insurance were more healthy and had a better outlook on their own health in general, were more financially secure and were less likely to suffer from depression than their uninsured peers. More than 28 million Americans are uninsured, according to the authors.

The report comes as Congress debates how it will reform or repeal the 2010 Affordable Health Care Act. According to estimates by the Congressional Budget Office, the Senate’s health-care proposal will result in a loss of insurance for 22 million Americans. A proposal that passed the House of Representatives with the support of President Donald Trump would leave 23 million Americans without health insurance, according to the CBO.

Among the studies reviewed by the Annals of Internal Medicine was a 2012 Harvard University report that looked at the health impacts on istate residents from the 2006 Massachusetts health-care reform instituted by then-Gov. Mitt Romney. Using a control group of adults living outside the state, the study found that one death was averted for every 830 adults gaining coverage under Massachusett’s universal care initiative.

The Annals researchers used that one-in-800 ratio to estimate that there could be 29,000 premature deaths annually should the Senate health-care proposal pass and lead to the expected increase of uninsured Americans.

The Senate has postponed debate on the bill as Republicans search for the 50 votes needed for passage.