A new research study has claimed that the cardiovascular disease has been gradually declining in most parts of the United States.

Researchers warned that it remains the largest cause of death in the country but the rate is slowing declining across most parts of the country. A team of researchers from the CDC conducted an observational meta-analysis to study deaths from heart disease from 1973 to 2010. Researchers said that cardiovascular diseases include coronary artery disease.

The researchers studied data from all counties in the US recording Cardiovascular disease deaths between 1973 through 2010. They found that the rate of death fell by almost 62 percent during the period across the country. However, they said that there were large differences between individual counties. Some counties recorded a decline of up to 83 per cent while others only saw a decline of 9 per cent during the period. Some of the places that recorded the smallest decline include places in Texas, Alabama, Arkansas, Louisiana, Oklahoma and Mississippi.

Casper, an epidemiologist at the U. S. Centers for Disease Control and Prevention, said, "But from other studies we know the socioeconomic conditions of a county can affect rates of smoking and obesity, or whether people have access to affordable, healthy food, for example."

The study was published in the journal Circulation on 22 March, 2016.