In a multivariate logistic regression model , predictors of virological suppression included efavirenz use [ odds ratio ( OR ) 0.47 ; 95 % confidence interval ( CI ) 0.22-1 .02 ; P = 0.057 ] , lower cost of clinic visits ( OR 0.815 ; 95 % CI 0.66-1 .00 ; P = 0.05 ) , improvement in CD4 percentage ( OR 1.06 ; 95 % CI 1.014-1 .107 ; P = 0.009 ) , and care at Kayunga vs.Kangulamira ( OR 0.47 ; 95 % CI 0.23-0 .92 ; P = 0.035 ) .