Meta analysis data cleaning

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So the data that I'm working with has to do with proficiency in math/language arts. The test that I'm conducting would be how grade influences subject proficiency. Some studies included grades per test statistic (eg. p-value for 6th graders = 0.75), while some others included multiple grades in their statistic (eg. p-values for 6-8th graders = 0.82). My question is whether I can separate the second kind of data and copy-and-paste the statistics in my dataset. In the example, it would be that the p-value for 6th graders = 0.82, p-value for 7th graders = 0.82, and the p-value for 8th graders would be 0.82. Would that be statistically sound, or should I exclude these datapoints from the analysis?

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