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Table 3 Correlation between TST diameter (mm) and QFT-GIT results*

From: Using IFN-gamma release assay to confirm tuberculin skin test improves the screening of latent tuberculosis infection in Italian healthcare workers

 

IGRA

p-value

Negative

Positive

 

n.

%

n.

%

 

TST diameter (n.)

 0–9 (29)

29

100.0

-

-

0.001

 10–15 (75)

57

76.0

18

24.0

  > 15 (51)

37

72.5

14

27.5

  1. *p-value refers to the Fisher exact test to compare the frequency distribution of positive and negative QFT-GIT for three increasing diameter ranges