Table 6

 Estimation of annual risk of tuberculous infection (ARTI) by differences in the estimated prevalence of infection and mean age between two cohorts of different ages

Secondary peak(mm)% prevalence of infectionDifference in age(years)% ARTI(95% CI)
Age 6–7Age 8–9Difference(95% CI)
153.084.361.28 (0.56 to 2.00)1.960.68 (0.30 to 1.06)
14.53.725.141.42 (0.62 to 2.22)1.960.76 (0.33 to 1.18)
15.52.593.591.00 (0.33 to 1.67)1.960.52 (0.17 to 0.88)