첫 발생 연령 기준을 볼 때 노년기가 64.7%로 보고되어 직장 은퇴를 하지 않은 중년기에서의 이환율도 적지 않았다.
When looking at the first incidence age criteria, old age was reported at 64.7%, so the morbidity rate in the middle-aged without retirement from work was not small.