An approach is provided for determining associations and/or propensity among the word occurrences during a therapy interaction for supporting a procedure. The approach involves parsing captured therapy interaction data to identify one or more word occurrences. The approach also involves determining one or more associations among the one or more word occurrences using a fuzzy association analysis and deep belief networks. The approach further involves determining a propensity of the one or more associations based on a probability analysis. The approach also involves specifying the one or more associations as evidence data for supporting a therapeutic outcome, a mental state classification, or a combination thereof.