The interpretation of I 2 values was delineated as follows: 0%–40 % indicating that heterogeneity might not be significant; 30%–60 % suggesting the presence of moderate heterogeneity; 50%–90 % indicating the likelihood of substantial heterogeneity; and 75%–100 % suggesting considerable heterogeneity [ 16 ].
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Retinal thickness and vascular density changes in Keratoconus: A systematic review and meta-analysis.
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Additionally, there was a mildly to moderately significant increase in the optic nerve head (ONH) disk area (SMD: 0.40 [0.06, 0.75]).