Abstract
On March 11, 2011 at 2:46 PM a massive 9.0 magnitude earthquake occurred near the northeastern coast of Japan. This earthquake created extremely destructive tsunami waves that hit Japan just minutes after the earthquake. The earthquake and tsunami have caused extensive damage in East Japan. The explosion accident occurred at the Fukushima First Nuclear Power Plant the following day. A large number of evacuees from Fukushima have taken refuge in the Yamagata prefecture. The evacuees were screened for deep vein thrombosis (DVT) at the Ochiai Sports Center in Yamagata City. DVT was detected in 14 out of 123 people (11.4%). Logistic regression analysis was performed for the factors of female subjects over 40 years old. Through the screening, we discovered that the risk factors for DVT include gait disturbances and sleeping in the car overnight.
