Table 2 Proportion of positive tuberculin skin testing response stratified by the main collected variables

Gender

Male

3/279 (1.1), -0.001 – 0.023

0.75

Female

7/454 (1.5), 0.004 – 0.026

Nationality

Italian

6/692 (0.9), 0.002 – 0.016

0.001

Migrant

4/41 (9.8), 0.007 – 0.189

TB incidence of the country of birth*

≥20 cases per 100,000 population

4/12 (33.3), 0.066 – 0.600

<0.0001

<20 cases per 100,000 population

6/721 (0.8), 0.002 – 0.015

Potential professional exposure calculated without the interference of subjects coming from countries at high-incidence of TB

Pre-clinical students

3/136 (2.2), -0.003 – 0.046

0.09

Clinical students

3/585 (0.5), -0.001 – 0.011

BCG immunization

Not vaccinated

9/720 (1.3), 0.005 – 0.021

0.17

Vaccinated

1/13 (7.7), -0.068 – 0.222