Establishes ear length benchmarks in fetuses, indicating strong links to chromosomal disorders.
A prenatal standard for ear length was developed from ultrasonic images of 180 normal subjects. Length increased from about 6 mm at 15 weeks to 33 mm at term and was well fit by linear regression (r2 = .96). Short ears (≥1.5 SD below gestational age average) were associated strongly, and specifically, with chromosomal disorders.
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Birnholz et al. (1988) studied this question.
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