A recent report that utilized data from the United Nations, the World Bank and the World Health Organization ranked Singapore as the world's healthiest country, according to the Independent.

In order to comprehensively rank each country's health score, Bloomberg Rankings employed the use of a health score and a health risk score. The country's ranking was determined by subtracting a nation's health risk score from that of its health score.

The health score corresponds to the mortality rate of a country, while the health risk score corresponds to a variety of factors that are perceived to be limiting health, including the percentage of young people smoking and the number of people who are immunized, reported Business Insider.

Singapore was able to get excellent scores, topping the list with an overall grade of 89.45 percent. At its heels, in second place, is Italy, with a score of 89.07 percent. Australia ranked third, with an 88.33 percent score.

Notably, countries such as the United States and the United Kingdom were not able to make the top 20. The U.K. ranked 21st on the list, with a score of 76.84 percent. The U.S. holds the 33rd position, earning a score of 66.84 percent.

At the other end of the spectrum lies the African country of Swaziland, which was named the least healthy country in the world, with a score of 0.26 percent. Other African nations, such as the Democratic Republic of Congo, Chad and Mozambique, also dominated the list's bottom 10.