Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities
Between October 6, 1997 and April 30, 1999, 5011 births (mean: 8.76 per day) were registered in the city of Passo Fundo, South Brazil. The sequence of 572 daily birth numbers was not random (iteration test). Neyman distribution (m = <FONT FACE=Symbol>¥</FONT>) showed the best fit. Cluste...
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
Associação Brasileira de Divulgação Científica
2002-08-01
|
Series: | Brazilian Journal of Medical and Biological Research |
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000800017 |
id |
doaj-114de3c946bc414faf97940bdf99d688 |
---|---|
record_format |
Article |
spelling |
doaj-114de3c946bc414faf97940bdf99d6882020-11-24T20:45:09ZengAssociação Brasileira de Divulgação CientíficaBrazilian Journal of Medical and Biological Research0100-879X1414-431X2002-08-0135898599010.1590/S0100-879X2002000800017Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicitiesM. MikuleckyH.R.K. LisboaBetween October 6, 1997 and April 30, 1999, 5011 births (mean: 8.76 per day) were registered in the city of Passo Fundo, South Brazil. The sequence of 572 daily birth numbers was not random (iteration test). Neyman distribution (m = <FONT FACE=Symbol>¥</FONT>) showed the best fit. Clusters of days with higher birth numbers alternated with days with low numbers of births. Periodogram analysis revealed a significant periodicity of 6.98 days. The cosinor regression, testing 10 a priori supposed period lengths, found significant seasonality peaking in August-September and significantly highest birth numbers on Thursdays. Among the lunar and solar rotation cycles, the tropic lunar cycle and its 4th harmonic were most pronounced, in agreement with results concerning natality in Germany obtained by Svante Arrhenius in the 19th century. These findings confirm Derer-Halberg's concept of multiseptans. In addition to cycling, a significantly increasing linear trend with a daily increase of 0.0045 births was encountered. This documents a growth of the population in agreement with national statistical data.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000800017BirthsSouth BrazilPeriodogramCosinorSeasonalityWeekly rhythmMultiseptansCosmogeophysical-biomedical parallelismSolar and lunar cycles |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Mikulecky H.R.K. Lisboa |
spellingShingle |
M. Mikulecky H.R.K. Lisboa Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities Brazilian Journal of Medical and Biological Research Births South Brazil Periodogram Cosinor Seasonality Weekly rhythm Multiseptans Cosmogeophysical-biomedical parallelism Solar and lunar cycles |
author_facet |
M. Mikulecky H.R.K. Lisboa |
author_sort |
M. Mikulecky |
title |
Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities |
title_short |
Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities |
title_full |
Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities |
title_fullStr |
Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities |
title_full_unstemmed |
Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities |
title_sort |
daily birth numbers in passo fundo, south brazil, 1997-1999: trends and periodicities |
publisher |
Associação Brasileira de Divulgação Científica |
series |
Brazilian Journal of Medical and Biological Research |
issn |
0100-879X 1414-431X |
publishDate |
2002-08-01 |
description |
Between October 6, 1997 and April 30, 1999, 5011 births (mean: 8.76 per day) were registered in the city of Passo Fundo, South Brazil. The sequence of 572 daily birth numbers was not random (iteration test). Neyman distribution (m = <FONT FACE=Symbol>¥</FONT>) showed the best fit. Clusters of days with higher birth numbers alternated with days with low numbers of births. Periodogram analysis revealed a significant periodicity of 6.98 days. The cosinor regression, testing 10 a priori supposed period lengths, found significant seasonality peaking in August-September and significantly highest birth numbers on Thursdays. Among the lunar and solar rotation cycles, the tropic lunar cycle and its 4th harmonic were most pronounced, in agreement with results concerning natality in Germany obtained by Svante Arrhenius in the 19th century. These findings confirm Derer-Halberg's concept of multiseptans. In addition to cycling, a significantly increasing linear trend with a daily increase of 0.0045 births was encountered. This documents a growth of the population in agreement with national statistical data. |
topic |
Births South Brazil Periodogram Cosinor Seasonality Weekly rhythm Multiseptans Cosmogeophysical-biomedical parallelism Solar and lunar cycles |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000800017 |
work_keys_str_mv |
AT mmikulecky dailybirthnumbersinpassofundosouthbrazil19971999trendsandperiodicities AT hrklisboa dailybirthnumbersinpassofundosouthbrazil19971999trendsandperiodicities |
_version_ |
1716815240199405568 |