4.21 In a January 15, 1998, article, the New England Journal of Medicine reporte

Question

4.21 In a January 15, 1998, article, the New England Journal of Medicine reported on the utility of using computerized tomography (CT) as a diagnostic test for patients with clinically suspected appendicitis. In at least 20% of patients with appendicitis, the correct diagnosis was not made. On the other hand, the appendix was normal in 15% to 40% of patients who underwent emergency appendectomy. A study was designed to determine the prospective effectiveness of using CT as a diagnostic test to improve the treatment of these patients. The study examined 100 consecutive patients suspected of having acute appendicitis who presented to the emergency department or were referred there from a physician's office. The 100 patients underwent a CT scan, and the sur- geon made an assessment of the presence of appendicitis for each of the patients. The final clinical Med.

Explanation / Answer

Answer

b)

Given that radiologically determination was definite appendictis than

Total number of patient of definite appendictis=51

No of truly had appendictis=50

So probability=50/51=0.98

c)Total number of patient of definite appendictis=51

No of patient truly did not have appendictis=1

So probability=1/51=0.0196

d)

No of definitely appendictis patient=45

No of patient truly did not have appendictis=44

So probability=44/45=0.977

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