Figure 2:

Incidence of TB among migrants in BC (no. of cases/100 000 person-years at risk), stratified by the number of years since index date and demographic characteristics. (A) All participants, (B) age group, (C) immigration class and (D) incidence of TB in the country of birth. Rates of TB incidence (no. of TB cases/100 000 person-years) modelled as a smooth function of the number of years since index date using generalized additive models, with time represented as a cubic regression spline (degrees of freedom = 4) with knots set to the 30th, 50th, 70th and 90th percentiles of time (in accumulated person-years). Note: BC = British Columbia, TB = tuberculosis.