Sputum microscopy for the diagnosis of HIV-associated pulmonary tuberculosis in Tanzania

BMC Public Health

Table 1 Sputum microscopy and sputum culture results on all specimens

¹ 103 patients
² DNA probes performed on 166 isolates (94 SM positive, 72 SM negative); 46 additional isolates considered MTB based on growth and culture morphology
³ Excludes 79 culture contaminated and 31 NTM
⁴ Test characteristics of SM:
Sensitivity = 131/212 = 61.8%(95% CI 54.9% -68.4%)
Specificity = 9108/9132 = 99.7% (95% CI 99.6% – 99.8%)
Positive predictive value = 131/155 = 84.5% (95% CI 77.8% – 89.8%),
Negative predictive value = 9108/9189 = 99.1% (95% CI 98.9% – 99.3%)
LR (positive smear microscopy) = 235.1 (95% CI 155.8 – 354.3)
LR (negative smear microscopy) = 0.38 (95% CI 0.32 – 0.45)

ISSN: 1471-2458