Fig. 1From: The association between tuberculin skin test result and active tuberculosis risk of college students in Beijing, China: a retrospective cohort studyCumulative incidence curves of active TB estimated by Kaplan-Meier method. (a) Cumulative incidence curve analysis of different intervals of the mean diameter of TST induration (0~4, 5~9, 10~14, 15~19 and ≥ 20) (b) Cumulative incidence curve analysis of sexBack to article page