Yes, you can develop your own quality tool for meta-analysis. Meta-analysis is a statistical method for combining the results of multiple studies on a specific topic in order to increase the overall power of the analysis and to identify patterns or trends in the literature. Quality tools are used to assess the quality of the studies included in a meta-analysis, in order to ensure that the studies being included are of high quality and that the results of the meta-analysis are reliable.

When developing your own quality tool, it is important to consider the specific research question and the types of studies that will be included in the meta-analysis. The tool should be designed to assess factors that are relevant to the specific topic and question being investigated. Additionally, the quality tool should be developed in a transparent, consistent and reproducible manner, taking into account the previous studies that have been used to assess the quality of studies in similar meta-analyses.

It is also important to note that an established quality assessment tool such as Cochrane Risk of Bias tool, QUADAS-2, Newcastle-Ottawa Scale for observational studies, etc. are widely used and have been validated in previous studies, it is recommendable to use them as a guidance and compare the results with your own tool.