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RMA plots: (A) Ages and Stages Questionnaire and Preschool Language Scale, Slope = 0.996; Intercept = -0.009; (B) Sure Start Language Measure and Preschool Language Scale, Slope = 0.990; Intercept = -0.001; (C) Ages and Stages Questionnaire and Sure Start Language Measure, Slope = 1.005; Intercept = 0.002.
