1. Accuracy of Clinical Signs in the Diagnosis of Pulmonary Tuberculosis: Comparison of Three Reference Standards Using Data from a Tertiary Care Centre in Rwanda
- Author
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Boelaert Marleen, Van Den, Seruyange Eric, Van der Stuyft, Mugabekazi Julie, Moreira Juan, Bisoffi Zeno, Musemakweli André, Sarushi Joseph, Ende Jef, and Basinga Paulin
- Subjects
medicine.medical_specialty ,Tuberculosis ,business.industry ,medicine.disease ,Tertiary care ,Latent class model ,Surgery ,Pulmonary tuberculosis ,Radiological weapon ,Internal medicine ,medicine ,Disease characteristics ,business ,Prospective cohort study ,Reference standards - Abstract
Objective: To determine the prevalence of TB, and the diagnostic sensitivity and specificity of major disease characteristics in a tertiary hospital setting in Rwanda, relative to three reference standards. Study Design and Setting: A prospective study was conducted in which 300 consecutive patients with cough of at least 2-weeks duration were evaluated at a tertiary healthcare facility. We compared the estimates of TB prevalence and the di- agnostic accuracy of fever, haemoptysis, sputum smear microscopy, radiological signs, and HIV infection as generated by a latent class analysis (LCA) with those given by culture and by a composite reference standard (CRS), which relied on bacteriological confirmation and/or cavities. Results: LCA estimated the prevalence of TB at 44%. The most sensitive characteristics were fever (90%) and HIV infec- tion (86%), but both lacked specificity. The most specific characteristics were microscopy (99%), X-Ray cavities (97%) and apical infiltrates (93%). When culture was taken as a reference standard, the prevalence was 38%; for the CRS, it was 45%. For both, the diagnostic sensitivity and specificity were comparable to those obtained with LCA.
- Published
- 2008
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