Table 2.

Points system to evaluate the study design and methodology

CategoryCriteriaPoints
Data sourcePrimary and secondary3
Primary only2.5
Secondary only2
Type of studyQuantitative and qualitative3
Quantitative or qualitative1.5
Data recency<5 years3
5–10 years2.5
>10 years1
Not specified0
Time horizonLongitudinal3
Cross-sectional1.5
Study designSecond-order meta-analysis5
Meta-analysis4
Experimental (RCT)4
Quasi-experimental3.5
Non-experimental2
Sample sizeMeta-analysis > 10 math studies. Single study quantitative n > 350 based on ESSA; qualitative based on Creswell and Creswell’s guidelines3
Meta-analysis < 10 math studies. Single study quantitative n < 350 based on ESSA; qualitative based on Creswell and Creswell’s guidelines1
Not specified0
Source(s): Author’s own work
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