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Table 5 Two measures of nares test sensitivity based upon serial nares cultures

From: Assessing the role of undetected colonization and isolation precautions in reducing Methicillin-Resistant Staphylococcus aureustransmission in intensive care units

Ward Sensitivity of Detecting Nares Colonization (%)a Sensitivity of detecting colonization at any body site (%): Median (95% CI)b
M1 92 64 (56, 71)
M2 84 56 (47, 65)
GS1 82 61 (54, 69)
GS2 88 50 (42, 57)
SS1 89 62 (54, 68)
SS2 89 68 (60, 76)
SS3 85 55 (45, 64)
SS4 72 54 (44, 65)
Overall 85 59 (55, 63)
  1. a Given by the ratio TP/(TP+FN) where TP is the number of positive swabs excluding the first for each patient episode and FN the number of negative swabs that follow an earlier positive for the same patient.
  2. b The parameter p estimated from the model making use of cultures from all sites.