Fig. 2From: The plasma kynurenine-to-tryptophan ratio as a biomarker of tuberculosis disease in people living with HIV on antiretroviral therapy: an exploratory nested case–control studya Plasma kynurenine to tryptophan ratio and b sum of metabolites to tryptophan ratio in TB participants compared to that in controls at each visit. The bars represent the median with error bars indicating 95% confidence interval. The p values were calculated using Mann–Whitney testBack to article page