Season of birth is associated with anthropometric and neurocognitive outcomes during infancy and childhood in a general population birth cohort

Department of Psychiatry, University of Queensland, St Lucia QLD, Australia.
Schizophrenia Research (Impact Factor: 4.43). 02/2006; 81(1):91-100. DOI: 10.1016/j.schres.2005.07.017
Source: PubMed

ABSTRACT The 'season of birth' effect is one of the most consistently replicated associations in schizophrenia epidemiology. In contrast, the association between season of birth and development in the general population is relatively poorly understood. The aim of this study was to explore the impact of season of birth on various anthropometric and neurocognitive variables from birth to age seven in a large, community-based birth cohort. A sample of white singleton infants born after 37 weeks gestation (n = 22,123) was drawn from the US Collaborative Perinatal Project. Anthropometric variables (weight, head circumference, length/height) and various measures of neurocognitive development, were assessed at birth, 8 months, 4 and 7 years of age. Compared to summer/autumn born infants, winter/spring born infants were significantly longer at birth, and at age seven were significantly heavier, taller and had larger head circumference. Winter/spring born infants were achieving significantly higher scores on the Bayley Motor Score at 8 months, the Graham-Ernhart Block Test at age 4, the Wechsler Intelligence Performance and Full Scale scores at age 7, but had significantly lower scores on the Bender-Gestalt Test at age 7 years. Winter/spring birth, while associated with an increased risk of schizophrenia, is generally associated with superior outcomes with respect to physical and cognitive development.

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    ABSTRACT: Objective: To examine seasonal effect on motor development; in particular, the onset of crawling. Background: The acquisition of motor milestones demonstrates considerable age variation. Previous studies that examined the effect of season on motor development present inconsistent findings; geographical zone and climatic factors were among the identified factors. The present study was conducted in a Mediterranean climate. Method: Forty-seven full-term infants (25 boys and 22 girls), aged 7 months, were observed while playing in the home context, and the Alberta Infant Motor Scale (AIMS) was administered. Results: Infants who were born during the winter–spring (W) months started to crawl about 4 weeks earlier compared to infants born during the summer–autumn (S) months (t = 3.13, p = 0.003). Similarly, the AIMS total scores (t = 2.03, p = 0.05) and prone subscale (t = 2.19, p = 0.04) were significantly higher in W as compared to S born infants. Conclusion: The findings point to the involvement of season in the motor achievements of infants and suggest that aspects of the physical environment shape the experiences that contribute to developmental progress.
    Journal of Reproductive and Infant Psychology 09/2013; 31(4). DOI:10.1080/02646838.2013.826347 · 0.67 Impact Factor
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    ABSTRACT: This study analyzes the marriage-market aspects of season of birth in the United States, estimating whether and how marital status is related to quarter of birth by gender and race, also incorporating cohabitation as a separate relationship status. For couples, additional analysis considers who is matched with whom and the spousal (partner's) trade-offs of quarters of birth and socioeconomic attributes. Using the American Community Survey data 2010-2012, I show that white women born in the fourth quarter are more likely to be married than never married (marriage more likely than cohabitation), while never married white men from the second birth quarter are less likely to be cohabiting than single. Black men from the first birth quarter are less likely to be married rather than cohabiting but more likely to be cohabiting than single. White women from the third birth quarter and black women from the second are more likely to be divorced, always controlling for demographic and socioeconomic characteristics. Among white married couples, men born in the first quarter have more educated and richer wives, and conversely women from the same first quarter have less educated husbands. In cohabiting couples, white men and women born in the third quarter have richer and less educated partners, respectively, and black women from the first quarter have poorer partners. Finally, in all types of couples, black women born in the fourth quarter have richer husbands.


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