A town with 1,000 citizens has a 10% prevalence of disease X. A screening test for disease X was just developed, with a sensitivity of 80% and a specificity of 70%. How many people without disease X will be falsely diagnosed positive by this screening test?
一个有1000名公民的城镇,X病的患病率为10%。刚刚开发出 X 病的筛查试验,敏感性为80%,特异性为70%。有多少没有疾病 X 的人会被这种筛查试验错误地诊断为阳性?
(A) 20
(B) 80
(C) 100
(D) 270
(E) 630
答案解析:
诊断为阳性 | 诊断为阴性 | |
真实为阳性 100 | 80 | 20 |
真实为阴性 900 | 270 | 630 |
正确答案:D
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