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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.