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
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% |