Long COVID-19 is having a significant effect on America’s workforce, preventing substantial numbers of people from going back to work while others continue needing medical care long after returning to their jobs, according to a new analysis of workers’ compensation claims in New York state.

The study, published Tuesday by New York’s largest workers’ compensation insurer, found that during the first two years of the pandemic, about 71% of people the fund classified as experiencing long COVID-19 either required continuing medical treatment or were unable to work for six months or more. More than a year after contracting the coronavirus, 18% of long COVID-19 patients had still not returned to work, more than three-fourths of them younger than 60, the analysis found.

"Long Covid has harmed the work force,” said the report, by the New York State Insurance Fund, a state agency financed by employer-paid premiums. The findings, it added, "highlight long Covid as an underappreciated yet important reason for the many unfilled jobs and declining labor participation rate in the economy, and they presage a possible reduction in productivity as employers feel the strains of an increasingly sick work force.”