Table 3.

Association between a positive tuberculin skin testing response and potential independent variables: results of multivariate logistic regression.

Variables	Multivariate analysis
	OR (95% CI)	P value
Nationality
Foreign/Italian	5.0 (0.5–45.4)	0.16
Born in a high TB incidence country*
Yes/no	2.3 (0.4–12.7)	0.35
BCG immunization
Yes/no	28.3 (3.0–265.1)	0.003
Professional exposure to active TB case
Professional exposure/no professional exposure	21.7 (2.9–160.2)	0.003

OR: odds ratio.

95% IC: 95% confidence interval.

TB: Tuberculosis.

BCG: Bacille Calmette-Guérin.

^*High incidence: ≥20 cases per 100,000 population [12].