Comparison of Sample Populations
All the researches that have been included in this study were meta-analyses or reviews of literature except Taveras et al. (2015) which included a randomized control trial. This study included a sample of 649 children between 6 and 12 years. The other studies were analyses of other researches that have been done in the past on obesity. Janicke et al. (2014) analysed 20 studies whose sample sizes amount to 1,671 participants. On the other hand, Ross et al. (2010) performed a review of 73 studies. The research does not indicate the number of participants represented by the analyzed studies. McGrath (2017) conducted a literature analysis of 7 articles. There is a variation between the sample sizes of the analyzed articles ranging from 12 participants to 9000 participants. Ickes et al. (2014) conducted a systematic analysis including 12 studies whose samples sizes range between 10 and 20 participants. In general the studies that have been included in this research have generally small sample sizes. Most of the studies are literature reviews with a very low number of studies included in the analysis. None of these studies is longitudinal in nature and the samples are very small. Therefore, there is a high chance that the studies are limited in terms of the choice of methods. The following is an analysis of the limitations of each of the studies.