A town with 1000 citizens has a 10% prevalence of disease X. A screening test for disease X just came out, with a sensitivity of 80% and a specificity of 70%. How many people with disease X will be missed by this screening test?
一个有1000名居民的城镇，X病的患病率为10%。X病的筛查试验刚刚出来，敏感性为80%，特异性为70%。该筛查试验将遗漏多少例 X 患者？
(A) 20
(B) 80
(C) 100
(D) 270
(E) 630
答案解析：
特异性 = TN/(TN+FP)
| 诊断为患病 | 诊断为健康 | |
| 100 | 80 | 20 |
| 900 | 270 | 630 |
正确答案：A
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