Covid-19 caused the average life expectancy of people worldwide to fall by 1.6 years during the first two years of the pandemic, a more dramatic decline than previously thought, a major study said Tuesday.

This marked a sharp reversal during a decades-long rise in global life expectancy, according to hundreds of researchers sifting through data for the US-based Institute for Health Metrics and Evaluation (IHME).

“For adults worldwide, the Covid-19 pandemic has had a more profound impact than any event seen in half a century, including conflicts and natural disasters,” said Austin Schumacher, an IHME researcher and lead author of the study published in The Lancet journal.

During 2020-2021, life expectancy declined in 84 percent of the 204 countries and territories analysed, “demonstrating the devastating potential impacts” of new viruses, he said in a statement.

The rate of death for people over 15 rose by 22 percent for men and 17 percent for women during this time, the researchers estimated.

Average life expectancy, which has been rising for decades around the world, suddenly declined in 2020 and 2021 at the height of the COVID-19 pandemic, according to a study published on Tuesday in The Lancet.

Life expectancy has declined in the vast majority (84%) of the more than 200 countries and territories studied by the researchers, that is, for all intents and purposes, around the world.

On average, out of all the data reviewed, life expectancy declined by more than a year and a half in 2020-21 (1.6 year). This resulted in an excess of 15.9 million deaths, slightly more than the estimated 15 million estimated by the World Health Organization (WHO) baseline.