Fig. 1.

A latent trajectory model with three observed repeated measures of affect (AFFECT_T1, T2 and T3); two growth parameters (INTERCEPT and SLOPE) and possible heterogenity of trajectories (CLASS) with covariates. I_MEAN, S_MEAN—an average values of affect baseline level and change during time of the study, respectively; I_VAR, S_VAR—variance of intercept and slope, i.e. interindividual variability in affect starting point and change, respectively; COV = covariance between intercept and slope. Error variances symbolised with arrows pointing to AFFECT variables. HIV DURATION—time-invariant antecedent in conditional model (see details in the text)