Standardised mean difference effect size, bias-corrected for small samples.
Hedges' g expresses the difference between two group means in pooled standard-deviation units, similar to Cohen's d but with a correction factor that reduces overestimation in small studies. Conventional benchmarks treat roughly 0.2 as small, 0.5 as moderate and 0.8 as large, though these cutoffs are context-dependent and should not be equated directly with clinical importance.
This guide was auto-drafted and is pending editorial review.