Table 1.

The characteristics of variables in the final data set

Variable	Type-scale	Description
Insurance ID	String-Nominal	Unique ID of the insured person
Sex	String-Nominal	Insured person’s sex
Age	Numeric-Discrete	Insured person’s age
Prescription ID	String-Nominal	Unique ID of each prescription
Provider ID	String-Nominal	Unique ID of each provider
Provider specialty	String-Nominal	The specialty of each provider
Medicine code	String-Nominal	Code of prescribed medicine
Medicine name	String-Nominal	Name of prescribed medicine