Summary of agreement and disagreement statistics for most prevalent pathogens and the report of at least one pathogen
| Overall prevalence | Overall disagreement | Difference (95% CI)* | McNemar’s P value | Overall agreement | Unadjusted kappa (95% CI) | PABAK | |
| At least one pathogen | 88.1% | 20.0% | 15.9% (11.8% to 20.1%) | <0.0001 | 80.0% | 0.44 (0.34 to 0.53) | 0.60 |
| Gram-positive cocci | 70.6% | 20.8% | 13.7% (9.4% to 18.0%) | <0.0001 | 79.2% | 0.57 (0.50 to 0.65) | 0.58 |
| Gram-negative bacilli | 36.7% | 15.4% | 9.4% (5.6% to 13.1%) | <0.0001 | 84.6% | 0.63 (0.55 to 0.71) | 0.69 |
| Enterobacteriaceae (including coliforms) | 26.6% | 12.9% | 5.8% (2.3% to 9.3%) | 0.0013 | 87.1% | 0.60 (0.50 to 0.70) | 0.74 |
| Obligate anaerobes | 23.8% | 16.5% | 6.8% (2.9% to 10.8%) | 0.0008 | 83.5% | 0.38 (0.26 to 0.50) | 0.67 |
| Gram-positive bacilli | 11.1% | 10.4% | 9.9% (6.9% to 13.5%) | <0.0001† | 89.6% | 0.11 (−0.01 to 0.23) | 0.79 |
| Streptococcus | 16.7% | 5.8% | 3.3% (0.9% to 5.6%) | 0.0067 | 94.2% | 0.76 (0.66 to 0.85) | 0.88 |
| Enterococcus (excluding VRE) | 14.9% | 10.1% | 7.1% (4.0% to 10.1%) | <0.0001 | 89.9% | 0.44 (0.30 to 0.58) | 0.80 |
| Coagulase-negative Staphylococcus | 12.2% | 10.1% | 9.6% (6.7% to 12.9%) | <0.0001† | 89.9% | 0.26 (0.11 to 0.41) | 0.80 |
| Corynebacterium | 9.4% | 8.6% | 8.1% (5.4% to 11.2%) | <0.0001† | 91.4% | 0.13 (−0.01 to 0.28) | 0.83 |
| Pseudomonas aeruginosa | 8.6% | 4.1% | 0.0% (−2.0% to 2.0%) | 1.0000 | 95.9% | 0.67 (0.52 to 0.82) | 0.92 |
| Staphylococcusaureus (excluding MRSA) | 35.7% | 8.1% | 0.0% (−2.8% to 2.8%) | 1.0000 | 91.9% | 0.81 (0.75 to 0.87) | 0.84 |
*Tissue-swab.
†Exact P value/CI.
MRSA, methicillin-resistant Staphylococcus aureus; PABAK, prevalence and bias-adjusted kappa; VRE, vancomycin-resistant Enterococcus.