CAT and diabetes mellitus: The results of the multivariate meta-analysis demonstrated full restoration of antioxidant SOD, CAT, and GSH activity of diseased rats suffering from diabetes mellitus as the differences ‘stevia – control’ were not statistically significant (SOD: d = −0.14 with p-value = 0.94, CAT: d = −0.14 with p-value = 0.94, and GSH: d = −1.73 with p-value = 0.06).