Latent class analysis
The results for the competing latent class models are presented in Table 4. The fit indices did not identify clearly which model provided the best explanation of the data (the log-likelihood value, Akaike and Bayesian information criteria and sample size adjusted Bayesian information criterion continued to decrease as the number of classes in the models increased). This was not unexpected, given that we had hypothesised a priori that underlying the categorisation of classes is a dimension of severity. This is not captured by LCA, but can be modelled using FMMA.