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Table 4 The sensitivity, specificity, PPV, and NPV of positive preoperative synovial fluid culture by organism profile

From: The concordance between preoperative aspiration and intraoperative synovial fluid culture results: intraoperative synovial fluid re-cultures are necessary whether the preoperative aspiration culture is positive or not

Pathogens Sensitivity Specificity PPV NPV
Staphylococcus spp. 80.43% (72.2 %, 88.7%) 83.16% (75.5%, 90.8%) 82.22% (74.2%, 90.3%) 81.44% (73.6%, 89.3%)
Enterococcus spp. 90% (67.4%, 100%) 98.87% (97.3%, 100%) 81.82% (54.6%, 100%) 99.43% (98.3%, 100%)
Streptococcus spp. 66.67% (12.5%, 100%) 95.58% (92.6%, 98.6%) 33.33% ( 2%, 64.6 %) 98.86% (97.3%, 100%)
Gram-positive Bacilli 80 % (24.5%, 100%) 100% (100%, 100%) 100% (100%, 100%) 99.45% (98.4%, 100%)
Fungi 100% (100%, 100%) 99.44% (98.3%, 100%) 88.89% (63.3%, 100%) 100% (100%, 100%)
Gram-negative Bacteria 100%  (100%, 100%) 99.44%  (98.3%, 100%) 90.91% (70.7%, 100%) 100% (100 , 100%)
Polymicrobial PJI 50% (5.3%, 94.7%) 100% (100%, 100%) 100% (100%,100%) 97.81% (95.7%, 100%)
  1. The values were given as percentages with the 95 % CI (confidence interval) in the parentheses