Use consistent naming convention for Initial Population. Initial Patient Population and Initial Population are used interchangeably. 

6.2- "In this case, we have criteria definitions for:

• Initial Patient Population "

6.3- "With this in mind, rather than expressing the entire initial patient population as..." and "For example, the actual criteria for the denominator is that the patient is in the initial patient population..."

Related url ://cql.hl7.org/2020May/02-authorsguide.html#clinical-quality-measure-logic