2.4 Perspectives of analysis

The conclusions of analyses on the costs of illnesses may be dramatically different depending on which perspective the researchers chose to adopt. Since first attempted and defined, COI studies have been a popular topic of research and


#### Table 2. Comparison of approaches to estimating the costs of illnesses.

debate among many researchers worldwide. Analyses in the established literature today are largely guided by three perspectives: namely, the payer perspective, the patient perspective, and the societal perspective [8–11].
