CD4 and tuberculosis: In our second sensitivity analysis where we explored the temporal nature of the association of TB with BMI using a 12-month covariate lag, the association with BMI < 18.5 was reduced (aSHR 2.58 (95% CI 1.12–6.03), the association with CD4 count < 50 was increased (aSHR 36.6 (95% CI 9.23–145.03) and the association with substance use was lost (Additional file 1: Table S2).