Document Detail

Seasonality of mean birth weight and mean gestational period in Japan.
MedLine Citation:
PMID:  8319945     Owner:  NLM     Status:  MEDLINE    
Seasonal variations of mean birth weight from January 1974 to December 1983 and of mean gestational period from January 1979 to December 1983 in Japan are analyzed by time-series analysis. This analysis decomposes the variation in a series into trend, seasonal variation, other cyclic changes, and a remaining irregular fluctuation. The results of the present analysis support the existence of a seasonal rhythm of mean birth weight and mean gestational period in Japan with statistical significance (p < 0.001). Seasonal patterns of mean birth weight show two peaks in May and October-November and two troughs in June-September and December. Mean gestational periods shows two peaks in October and February-March and a deep trough in winter and a much smaller one in June-September. Two time series demonstrated a coincidence in monthly variations with statistical significance. These results indicate that a part of seasonality in birth weight could be explained by the seasonal variations in mean gestational period.
S Matsuda; T Sone; T Doi; H Kahyo
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Human biology     Volume:  65     ISSN:  0018-7143     ISO Abbreviation:  Hum. Biol.     Publication Date:  1993 Jun 
Date Detail:
Created Date:  1993-08-03     Completed Date:  1993-08-03     Revised Date:  2011-04-18    
Medline Journal Info:
Nlm Unique ID:  0116717     Medline TA:  Hum Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  481-501     Citation Subset:  IM    
Department of Human Ecology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.
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MeSH Terms
Age Factors
Analysis of Variance
Birth Weight*
Fetal Death / epidemiology
Gestational Age*
Infant, Newborn
Japan / epidemiology
Least-Squares Analysis

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