2.  A meta-analysis method was performed in this study, to synthesize different results found between several studies. The MRU virtual library was used to access all the available research through the EBSCOhost databases. In an advanced search, the following keywords were used: “Students”, “Online”, and “Classes”. A limitation was set for research published within the last 5 years from February 2016 to February 2021 with articles published in English, Chinese, German, Korean, Polish, and Portuguese. The search provided access to 102 articles of which 1 of the studies was selected based on the topic and 101 were discarded.