Researchers from the All-Soviet Institute of Ophthalmology of the Ministry of Health of the Soviet Union confirmed the influence of biological rhythm through back-testing. They made a detailed analysis of 395 cases of ophthalmic surgery in Moscow 59th Hospital within three months. The results showed that 68% of the patients who were in trouble during the operation had bad biological rhythm, 63% had bad emotional rhythm, and more than 65% of the patients with bad biological rhythm had postoperative complications. Japan's Womi Railway Company investigated 33 1 accidents from 1963 to 1968, and found that 59% of them occurred in the driver's "dangerous period".
Schwien, a Swiss scientist, analyzed thousands of unfortunate incidents and found that there were five times more accidents in "critical period" than usual. American scientists also announced that 75% of car accidents and 50% of air crashes occurred when drivers were in a "critical period".