Multivariate logistic regression analysis of effects of prior and concomitant 3TC/FTC on virological suppression.

Monotherapy: patients treated with TDF without concomitant 3TC/FTC, i.e. groups A and C. Dual therapy: patients treated with TDF with concomitant 3TC/FTC, i.e. groups B and D. 3TC/FTC naïve: patients not previously exposed to 3TC/FTC before TDF treatment, i.e. groups A and B. Prior 3TC/FTC exposure: patients previously exposed to 3TC/FTC before TDF treatment, i.e. groups C and D. OR: odds ratio. CI: confidence interval The effects comparing groups A and C and comparing groups A and B in year 3 were non-estimable as there is only one patient in group A.