marginally significantp = .067
A Generalized Linear Model with predictors contour density (4.5 or 5.5 mm), contour-background ratio condition (fixed ratio or fixed background), and number of digits (one or all) showed main effects for contour density (Wald χ 2 df = 1 = 590.05, p<.0001) and for contour-background ratio (Wald χ 2 df = 1 = 9.53, p<.01), and a marginally significant interaction between these two factors (Wald χ 2 df = 1 = 3.36, p = .067).