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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