The first international study of the effects of the Chernobyl nuclear accident suggests its impact on the health of hundreds of thousands of Soviet citizens has been exaggerated.

The report, released Tuesday for a four-day conference on the 1986 accident, said researchers found widespread stress and anxiety among citizens of affected areas of the Ukraine, Byelorussia and the Russian Republic.But the researchers found no evidence to corroborate suggestions from other scientists that hundreds, thousands or even tens of thousands of people would suffer leukemia, thyroid and other health problems as a result of the world's worst nuclear power plant accident.

However, the yearlong study, conducted by 200 researchers from 25 countries under U.N. auspices, did not look at people evacuated from around the plant or at the workers who helped clean up after the disaster. Those are being monitored separately in a Soviet data bank said to cover 530,000 to 570,000 people.