What makes a difference on COVID-19 death rate?

While governments worldwide are still racing against the clock to contain the novel coronavirus disease (COVID-19) within their own countries, U.S. President Donald Trump took comfort in his accusations over death toll numbers in different countries.

The U.S. president said in a contentious White House press briefing on Saturday: “Does anybody really believe these figures?” and insinuated that China had underreported the fatalities it suffered from the coronavirus outbreak, citing China’s death per 100,000 people at 0.33.
Though China’s population is more than four times that of the United States, the number of COVID-19 deaths in China was less than 10 percent of the U.S.

China has reported 4,642 coronavirus deaths as of April 24, compared with 49,954 deaths in the United States, according to data from the World Health Organization (WHO) and Johns Hopkins University.

VARIOUS DEATH RATES

What does the death rate mean? Why does it vary in different countries?UNB