Data that focus not on age but on length of service give similar results and confirm that the frequency rate of work accidents decreases with length of service. 事故的次數的多少與人的年齡無(wú)直接關(guān)系,但與服務(wù)的年限的長(cháng)短有關(guān),事故的頻率隨著(zhù)服務(wù)年限的增長(cháng)而減少。