Figure 2– Annual incidence rate of tuberculosis (TB) in contacts by year of follow-up, according to country income. World Bank Income Gross National Income per capita: low income (≤$1,005 per yr); lower-middle income ($1,006 to $3,975 per yr); upper-middle income ($3,976 to $12,275 per yr); high income (≥$12,276 per yr) [22]. *: p<0.05, statistically significant difference between contacts from high compared to low–middle-income countries. #: [25, 32, 36–50, 102–106, 110–127, 185–193]; ¶: [33, 34, 103–105, 129, 135, 136, 140, 143, 144, 148–151, 153, 157, 163, 164, 172, 194–202]. Refer to the supplementary material for complete details of outcomes, estimates of heterogeneity and outcomes of individual included studies.