Show simple item record Lerfald, Jennifer L. en_US 2007-05-22T15:11:41Z 2007-05-22T15:11:41Z 2001-05-01T00:00:00Z en_US
dc.description.abstract Birth weight has implications for multiple psychological and physical conditions throughout life. Birth weight is known to be affected by many factors, such as gestational age, maternal nutrition, cigarette smoking, hormones, and maternal height, weight, age, and parity. An additional intriguing correlate of birth weight is season-of-birth. Existing research suggests that seasonality in birth weight from equatorial countries depends on food availability and maternal physical labor. North of the Tropic of Cancer (23.5N), higher birth weights occur in the late winter and spring, and the most prevalent explanatory hypotheses concern the influences of temperature or day length. The seasonal pattern would be expected to be offset by six months in the Southern Hemisphere, but only one study was found from south of the Tropic of Capricorn (23.5S). Thus, in this study, time series analyses of a 20-year, million-birth New Zealand sample tested the hypothesis that heavier birth weights will occur in the spring. Theresults support hypotheses that seasonally varying factors, such as temperature and day length, affect fetal growth during the gestational period, resulting in seasonal birth weight differences. en_US
dc.format.extent 2822252 bytes
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dc.language en en_US
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title Seasonal factors and birth weight, new evidence from the Southern Hemisphere en_US
dc.type info:eu-repo/semantics/masterThesis
dc.type master thesis en_US Psychology en_US Master of Arts (M.A.) en_US

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