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Table 4 Cohens Kappa for positivity of qPCR resp. Kato-Katz between baseline day 1 and day 2 and between follow-up day 1 and day 2

From: Performance of the Kato-Katz method and real time polymerase chain reaction for the diagnosis of soil-transmitted helminthiasis in the framework of a randomised controlled trial: treatment efficacy and day-to-day variation

 

Baseline (day 1 vs day 2)

Follow-up (day 1 vs day 2)

 

Observed agreement (%)

Expected agreementa (%)

κ

P-value

Observed agreement (%)

Expected agreement (%)

κ

P-value

qPCR

 T. trichiura

81.4

56.4

0.57

< 0.001

76.4

59.3

0.42

< 0.001

 A. lumbricoides

84.4

57.5

0.63

< 0.001

83.5

81.8

0.1

0.043

 Hookworm

88.2

71.8

0. 58

< 0.001

89.9

78.9

0.52

< 0.001

Kato-Katz

 T. trichiura

96.4

53

0.92

< 0.001

79.4

53.2

0.57

< 0.001

 A. lumbricoides

98

72.6

0.93

< 0.001

99.1

99.1

0

0.5319

 Hookworm

95.6

84.3

0.72

< 0.001

97.2

93.6

0.56

< 0.001

  1. aPercentage of agreement expected based on chance alone (i.e. if the two results compared were completely uncorrelated)
  2. Abbreviations: κ, Cohen’s kappa coefficient; T. trichiura, Trichuris trichiura; A. lumbricoides, Ascaris lumbricoides