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Table 3 Performance of quantitative culture and semi-quantitative culture techniques to detect pathogen for microbiological diagnosis compared to the clinical diagnosis of lower respiratory tract infection

From: Evaluation of semi-quantitative compared to quantitative cultures of tracheal aspirates for the yield of culturable respiratory pathogens – a cross-sectional study

Statistic Quantitative Culture Semi Quantitative Culture
  Value 95% CI Value 95% CI
Sensitivity 59.4% 48.9% to 69.3% 60.4% 49.9% to 70.3%
Specificity 70.9% 59.6% to 80.6% 68.4% 56.9% to 78.4%
Positive Likelihood Ratio 2.04 1.39 to 2.99 1.91 1.33 to 2.74
Negative Likelihood Ratio 0.57 0.43 to 0.76 0.58 0.43 to 0.77
Positive Predictive Value 71.3% 62.9% to 78.4% 69.9% 61.8% to 76.9%
Negative Predictive Value 59.0% 52.0% to 65.5% 58.7% 51.6% to 65.5%
Diagnostic Accuracy 64.6% 57.0% to 71.6% 64.0% 56.4% to 71.1%
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