Impaired large numerosity estimation and intact subitizing in developmental dyscalculia.

The average K was 1.76 for the dyscalculics (range = .68–2.77, SD = .5) and 2.26 for the controls (range = 1.23–3.26, SD = .52), a highly significant difference, t (62) = -3.85, p < .001, d = .96.

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Importantly, however, dyscalculics were more impaired at comparing pairs of numbers characterized by a small numerical distance, indicated by a significant group by distance interaction for RTs and by a marginally significant interaction for accuracy (accuracy: F (7,434) = 1.87, p = .07, η 2 G = .02; for RTs: F (7,434) = 2.48, p = .02, η 2 G = .005).

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