Table 4.

Quality criteria for primary study selection.

Type	Definition
Internal Validity	The point of the investigation, setting, and suppositions are introduced in the examination.
External Validity	The discoveries ought to be sufficiently genuine to be connected in the industry or the scholarly community.
Construct Validity	The connection between the research questions used to quantify/assess and the results are well characterized.
Conclusion Validity	The study and ends are consistent with the RQs and obtained from experimental/hypothetical investigation.