Table 1: Prevalence of LTBI in the working population per gender, age group, country of birth and occupation.

Variables Number of subject with LTBI LTBI
Prevalence %
P value
Subjects 77/3622 2.1 -
Age - - -
          40 years old 27/2627 0.4 0.01
          ≥40 years old 24/993 5.2
Sex - - -
          Male 38/1295 2.9 0.05
          Female 39/2327 1.7
Country of birth - - -
          Italy 69/3471 1.9 0.01
          Foreign country 8/151 5.3
Job category - - -
          Nurse 36/652 5.5 0.01
          Other professions 41/2970 1.5

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