Fig. 1From: Modification and verification of the Infant–Toddler Meaningful Auditory Integration Scale: a psychometric analysis combining item response theory with classical test theoryItem trace lines of the 9 items (item 2–10) in ITMAIS. The x axis ‘θ’ represents the range of EPLAD. The y axis ‘P(θ)’ means the probability of an individual with specified EPLAD to respond to different categories of an itemBack to article page