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Table 2 Tuberculin skin test (TST) conversions and tuberculosis (TB) incidence in 8 male and 4 female Brazilian prisons (N = 1,422)

From: Impact of mass-screening on tuberculosis incidence in a prospective cohort of Brazilian prisoners

Variables Prisons  
  Male Female Total
Capacity 2,469 451 2,920
Inmate population 6,552 669 7,221
Individuals enrolled at baseline 2,861 519 3,380
Individuals followed for 1 year 1,235 187 1,422
TST-negative subjects 905 155 1,060
TST converted subjects 256 16 272
TST conversion rate, %a 28 (25–32) 10 (6–17) 26 (23–29)
 Incident cases reported between screenings 17 1 18
 TB cases at 1st screening 10 0 10
 TB cases at 2nd screening 7 0 7
TB incidence, %a,b 1.39 (0.81–2.22) 0.53 (0.01–2.98) 1.27 (0.76–2.02)
  1. Abbreviations: TB tuberculosis; TST tuberculin skin test
  2. aPercentage and 95 % confidence interval
  3. bCases identified between screenings or at second screening as a proportion of individuals followed for 1 year