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【单选题】
根据某医院10年来肺癌住院病人500例分析,吸烟者占75%,不吸烟者占25%,说明吸烟者易患肺癌,此种说法A.
正确，因为这是患病者中的吸烟率
B.
错误，因为没有计算P值
C.
错误，因为只是一个医院的资料，代表性不好
D.
错误，因为只是病例组的资料，无对照组的资料
E.
正确，且吸烟者肺癌发生率为不吸烟者的3倍
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