Relationship between baseline or time-varying characteristics and interval (days) between viral load measurements on multivariable mixed model analysisa.

The intercept represents the average interval for a non-MSM who is a seafarer, lives ≥160 kilometers from Zagreb, has high school or lower education, has had at least one CART change, is taking a non-NNRT regiment, has a CD4 cell count of 350 per µL, is treated in 2008/09 and has a follow-up time of 2 years.aAdjusted for the linear and quadratic term of time.bLeast square means estimates from the model.cWhen 47 potential outlying observations were removed the result became insignificant (p = 0.376).MSM, men who have sex with men; CART, combination antiretroviral therapy; NNRT, non nucleoside reverse transcriptase inhibitor.