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Table 1 Baseline characteristics of study population

From: Decreased annual risk of tuberculosis infection in South Korean healthcare workers using interferon-gamma release assay between 1986 and 2005

  All participants (N = 3233)
Age (year), median (IQR) 38 (29–46)
 20–29 835 (25.8)
 30–39 904 (28.0)
 40–49 999 (30.9)
 50–59 449 (13.9)
 ≥ 60 46 (1.4)
Gender; female 2348 (72.6)
BMI (kg/m2), median (IQR) 22 (20–24)
Smoking statusa  
 Never smoker 2341 (72.4)
 Ex-smoker (quit ≥ 1 year) 243 (7.5)
 Current smoker 189 (5.8)
Health care professions  
 Administrative 46 (1.4)
 Technicianb 449 (13.9)
 Health aidsc 999 (30.9)
 Physicians 835 (25.8)
 Nurses 904 (28.0)
Work duration (month), median (IQR)  
 < 12 months 360 (11.1)
 12 to < 60 months 722 (22.3)
 60 to < 120 months 279 (8.6)
 120 to < 240 months 667 (20.6)
 240 to < 360 months 972 (30.1)
 > 360 months 230 (7.1)
Comorbiditiesd  
 Hypertension 210 (6.5)
 Diabetes mellitus 85 (2.6)
Findings on chest X-raye  
 No active lung lesion 3063 (94.7)
 Previously healed TB 42 (1.3)
Positive results of IGRA 780 (24.1)
  1. Data are presented as numbers (percentages) unless otherwise indicated
  2. aTotal 2773 HCW, 460 missed data
  3. bTechnicians who perform radiological, laboratory and pathology testing
  4. cEmployees who provide physiotherapy and patient transfer services
  5. dTotal 2918 HCWs, 315 missed data
  6. eTotal 3105 HCWs, 128 missed data