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Birth Seasonality in Present-Day Italy, 1993–2005

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Notes

  1. Since some regions present internal climatic variability, a different set of regional weather stations, taken from the website http://www.wunderground.com/global/IY.html, was used as control. The results are totally consistent with those described in “Results” section.

  2. Albeit the constraint applied to LS regression models allows to estimate coefficients for all the 12 monthly dummy variables, this restriction does not allow for a correct computation of R 2. Nevertheless, this measure can be obtained by estimating the same models without constraint. The substantial difference is in the estimates of the dummy parameters, as in this second approach one dummy is dropped for multicollinearity reasons. Thus, Model 4 explains about 40% of the total variability in lnbt, and all models but Model 3 show a significant variation in R 2.

  3. The reference period accords to the World Meteorological Organization, which requires the calculation of averages for periods of 30 years, with the latest in 1961–1990.

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  1. Department of Genetics Anthropology Evolution, University of Parma, Parma, Italy

    Matteo Manfredini

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Manfredini, M. Birth Seasonality in Present-Day Italy, 1993–2005. Hum Ecol 37, 227–234 (2009). https://doi.org/10.1007/s10745-009-9221-x

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