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Effect sizes (Hedge’s g) for legibility and speed, by curriculum.
Note. Effect sizes are interpreted as follows: 0.20 = small effect, 0.50 = medium effect, 0.80 = large effect. Negative effect sizes reflect intervention changes in the opposite-than-expected direction (i.e., slower handwriting after the intervention). HWT = Handwriting Without Tears; HWT–GSS = Handwriting Without Tears–Get Set for School; Pre-K = prekindergarten; VPM = visual–perceptual–motor training.
