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Bland–Altman Plots: (A) Ages and Stages Questionnaire and Early Communication Indicator [95% limits of agreement: -2.55 to 2.48]; (B) Communicative Development Inventory and Early Communication Indicator [95% limits of agreement: -2.21 to 2.33]; (C) Ages and Stages Questionnaire and Communicative Development Inventory [95% limits of agreement: -2.10 to 2.06].
