Table 2 Results of univariate and multivariate regression analyses showed independent variables and their crude odds ratios (ORs) and adjusted odds ration (Adjusted ORs) with 95% confidence interval (95% CI) for having a tuberculin test conversion.

Working unit

   Office

1.00

1.00

   Inpatient unit

2.26 (1.44–3.54)

1.99 (1.25–3.17)

   Outpatient unit

2.10 (1.22–3.60)

1.91 (1.10–3.17)

   Critical care unit

1.69 (0.59–3.64)

1.31 (0.52–3.30)

   Operating room

1.40 (0.70–2.80)

1.50 (0.77–3.12)

   Laboratory unit

2.10 (0.90–4.92)

2.04 (0.84–4.96)

History tuberculosis exposure in the past year

2.46 (1.63–3.72)

2.26 (1.47–3.47)

History of prevention by any method^a

1.66 (1.16–2.39)

Not retained

History of surgical mask use^a

1.92 (1.34–2.76)

Not retained