Document Detail

Intra-individual variability in infancy: structure, stability, and nutritional correlates.
MedLine Citation:
PMID:  18335489     Owner:  NLM     Status:  MEDLINE    
Intra-individual variability (IIV) refers to relatively stable differences between individuals in the degree to which they show behavioral fluctuations over relatively short time periods. Using temperament as a conceptual framework the structure, stability, and biological roots of IIV were assessed over the first year of life. Biological roots were defined by maternal and infant nutrition. The sample was 249 Peruvian neonates, followed from the second trimester of pregnancy through the first 12 months of life. Maternal anthropometry, diet, iron status, and fetal growth were assessed prenatally. Neonatal anthropometry and iron status were assessed at birth. Degree of exclusive breastfeeding was assessed at 3 and 6 months, infant anthropometry was assessed at 3, 6, and 12 months, infant dietary intake was assessed at 6 and 12 months and infant iron status was tested at 12 months. Individual differences in IIV at 3, 6, and 12 months were derived from a residual standard deviation score based on infant behaviors measured using the Louisville Temperament Assessment Procedure. Principal components analysis indicated that individual differences in IIV were defined by two components at 3, 6, and 12 months. There was modest stability between IIV components assessed at 3 and 12 months. Reduced levels of IIV at 3 months were predicted by higher maternal weight and higher fetal weight gains in the first and second trimesters of pregnancy. Higher levels of IIV at 3 months were predicted by higher levels of maternal hemoglobin during pregnancy and higher levels of neonatal ferritin.
Theodore D Wachs; Hilary Creed Kanashiro; Pinar Gurkas
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Developmental psychobiology     Volume:  50     ISSN:  1098-2302     ISO Abbreviation:  Dev Psychobiol     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-03-17     Completed Date:  2008-04-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0164074     Medline TA:  Dev Psychobiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  217-31     Citation Subset:  IM    
Department of Psychological Sciences, Purdue University, West Lafayette, IN 47907, USA.
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MeSH Terms
Birth Weight
Breast Feeding
Child Psychology*
Ferritins / metabolism
Infant Behavior
Infant Nutrition Disorders / blood,  psychology
Infant, Newborn
Nutrition Assessment*
Poverty Areas
Prenatal Exposure Delayed Effects
Risk Factors
Reg. No./Substance:

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