经调查甲乙两地的冠心病粗死亡率均为4/10<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230218/14002315_0.gif">，经统一年龄构成后，甲地标化率为4.5/10<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230218/14002315_0_1.gif">，乙地为3.8/10<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230218/14002315_0_2.gif">。因此可认为