ABSTRACT The purpose of this study was to establish a set of normative data (growth curve and centiles) for the Infant Monitor of vocal Production (IMP) using a representative population of infants with typically developing hearing. A linear mixed effect model and regression was used to derive ‘stage-for-age’ trajectory and growth centiles from the standard sequence of IMP assessment scores of 85 infants with normal hearing (age range 3–13 months). A significant linear relationship was demonstrated between IMP scores and infant age (p < .001). No significant relationship was found between IMP scores and gender, mono/bilingual language environment, singleton/sibling status, maternal education, or maternal work status. Inter-rater reliability and correlation for agreement was strong (0.94). These findings show that IMP assessment depicts the vocal development of infants with normal hearing as an hierarchical relationship between the complexity of infant vocal productions and infant age. Normative gains in vocal competency (−1SD/+1SD) approximated one IMP question per month of age from an infant’s baseline level of IMP achievement.

中文翻译：

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婴儿发声监测 (IMP) 规范性研究：重要基础

摘要 本研究的目的是为婴儿发声监测 (IMP) 建立一组规范数据（生长曲线和百分位数），使用具有典型听力发育的婴儿的代表性人群。线性混合效应模型和回归用于从 85 名听力正常婴儿（年龄范围 3-13 个月）的 IMP 评估分数的标准序列中得出“年龄阶段”轨迹和生长百分位数。IMP 评分与婴儿年龄之间存在显着的线性关系（p < .001）。IMP 分数与性别、单/双语环境、单身/兄弟姐妹状态、母亲教育或母亲工作状态之间没有发现显着关系。评估者间的可靠性和一致性的相关性很强（0.94）。这些发现表明，IMP 评估将具有正常听力的婴儿的声音发育描述为婴儿发声的复杂性与婴儿年龄之间的等级关系。从婴儿的 IMP 成绩基线水平开始，声乐能力的规范增益 (-1SD/+1SD) 大约为每个月龄一个 IMP 问题。