Table 1.

Characteristics of the study population

VariableNo. (%)
Subjects, total35 (100)
Age
    20–29 yr5 (14.3)
    30–39 yr8 (22.9)
    40–49 yr16 (45.7)
    ≥50 yr6 (17.1)
Sex
    Male7 (20.0)
    Female28 (80.0)
Foreign country of birth6 (17.1)
Birth in high-TB-incidence countrya2 (5.7)
Personal history of TBb1 (2.9)
TB screening risk classification
    Low17 (48.6)
    Medium18 (51.4)
Duration of employment in health care
    1–9 yr7 (20.0)
    10–19 yr11 (31.4)
    20–29 yr8 (22.9)
    ≥30 yr9 (25.7)
Prior tuberculin skin testc30 (85.7)
Results of prior tuberculin skin test
    Positive14 (46.7)
    Negative16 (53.3)
BCG vaccination
    Yes20 (57.1)
    No15 (42.9)
Health care profession
    Nursing or physician14 (40.0)
    Other21 (60.0)
  • a Countries with an annual TB incidence of >50 per 100,000 population (according to the World Health Organization) included Estonia (n = 1) and Kazakhstan (n = 1).

  • b The year of personal history of TB was 1948.

  • c The prior tuberculin skin test had been administered a means of 11 ± 6.1 (range, 3 to 21) years ago. In the majority of subjects (24/30; 80.0%) the qualitative multipuncture method was used.