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Table 2 ARTI estimates and prevalence of infection presented for all adolescents, those with and without a BCG scar

From: Estimating the annual risk of infection with Mycobacterium tuberculosis among adolescents in Western Kenya in preparation for TB vaccine trials

  N Mean age (years) ≥ 10 mmb Mirror method 17 mma
P ARTI CI (95%) P ARTIc CI (95%)
All 4808 14.4 32.1% 2.6% (2.2,3.1) 27.6% 2.2% (1.8,2.6)
BCG scar 3947 14.4 33.5% 2.7% (2.2,3.2) 27.8% 2.2% (1.7,2.7)
BCG scar absent 859 14.2 25.6% 2.1% (1.1,3.1) 27.0% 2.1% (1.1,3.1)
  1. CI 95% Confidence interval
  2. aThe total number of adolescents with true reactions was calculated by adding the number of adolescents showing reaction sizes equal to the mode to double the number with reaction sizes larger than the mode to determine the numerator
  3. bThe Cut-off for HIV+ was ≥5 mm
  4. cARTI formula =1-(1-prevalence of infection) 1/mean age