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Infant head circumference growth is saltatory and coupled to length growth.
MedLine Citation:
PMID:  21419585     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Rapid growth rates of head circumference and body size during infancy have been reported to predict developmental pathologies that emerge during childhood. AIMS: This study investigated whether growth in head circumference was concordant with growth in body length. SUBJECTS: Forty infants (16 males) were followed between the ages of 2days and 21months for durations ranging from 4 to 21months (2616 measurements). STUDY DESIGN: Longitudinal anthropometric measurements were assessed weekly (n=12), semi-weekly (n=24) and daily (n=4) during home visits. Individual head circumference growth was investigated for the presence of saltatory patterns. Coincident analysis tested the null hypothesis that head growth was randomly coupled to length growth. RESULTS: Head circumference growth during infancy is saltatory (p<0.05), characterized by median increments of 0.20cm (95% confidence interval, 0.10-0.30cm) in 24-h, separated by intervals of no growth ranging from 1 to 21days. Daily assessments identified that head growth saltations were coupled to length growth saltations within a median time frame of 2days (interquartile 0-4, range 1-8days). Assessed at semi-weekly and weekly intervals, an average 82% (SD 0.13) of head growth saltations was non-randomly concordant with length growth (p≤0.006). CONCLUSIONS: Normal infant head circumference grows by intermittent, episodic saltations that are temporally coupled to growth in total body length by a process of integrated physiology that remains to be described.
Authors:
Michelle Lampl; Michael L Johnson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-17
Journal Detail:
Title:  Early human development     Volume:  -     ISSN:  1872-6232     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7708381     Medline TA:  Early Hum Dev     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Anthropology, Emory University, Atlanta, GA 30322, USA.
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