This is a retrospective cohort study comprising of mothers of all singleton infants born in public health
facilities within the Sydney Local Health District (SLHD) and South-Western Sydney Local Health
District (SWSLHD). The first stage of the analysis was to cluster the cohort into groups according to their demographic and psycho-social indicators. The goal is to discover subgroups amongst the measurements made on this population without an associated response measurement. He used latent class models for this analysis. In the second stage he conducted Supervised Statistical Learning approach for Model Building, Internal Validation and Model Interpretation.