Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia

Background: Our previous studies have shown that the monthly rhythm of menarche is associated to the expectancy of holidays or vacations. If this hypothesis is true, menarche episodes in Chile should cluster in December, the month prior to summer vacations. Aim: To study whether the expectancy of ho...

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Autor principal:	Valenzuela,Carlos Y
Lenguaje:	Spanish / Castilian
Publicado:	Sociedad Médica de Santiago 2006
Materias:	Holidays Menarche Seasons
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872006000500009
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spelling	oai:scielo:S0034-988720060005000092006-06-22Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquiaValenzuela,Carlos Y Holidays Menarche Seasons Background: Our previous studies have shown that the monthly rhythm of menarche is associated to the expectancy of holidays or vacations. If this hypothesis is true, menarche episodes in Chile should cluster in December, the month prior to summer vacations. Aim: To study whether the expectancy of holidays or vacations is the main determinant of the annual rhythm of menarche. Material and methods: During 1990 and 1991, a questionnaire about the date of birth and date of menarche, was applied to girls living in Santiago (Chile) and Medellin (Colombia), aged 8 to 18.5 years. They were requested to register the year, month or day of menarche, only if they recalled it precisely. Results: Discarding clerical errors, data was obtained from 3,225 Chilean and 3,435 Colombian girls. Of these 73 and 63% of Chilean and Colombian girls recalled the day of menarche. Among Chilean girls an excess of menarche episodes was observed in December, January and February. The mean age per month of menarche reached its highest value of 155.6±15 months in December and fell to 148±17 months in January (p <0.001). Among Colombian girls, mean age per month of menarche was also higher in December and lower in January (152±15 and 147±14 months respectively, p <0.001). However a peak of 152±15 months was also observed in June. Conclusions: A similar distribution of menarche episodes was observed among Chilean and Colombian girls, with a peak in the months preceding holidays. The influence of the photoperiod is unlikely since Medellin is located in parallel 6 and there are little variations in daylight exposure in the different seasons. Therefore, our data supports the hypothesis that the prospect of holidays is a determinant of menarcheinfo:eu-repo/semantics/openAccessSociedad Médica de SantiagoRevista médica de Chile v.134 n.5 20062006-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872006000500009es10.4067/S0034-98872006000500009
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	Holidays Menarche Seasons
spellingShingle	Holidays Menarche Seasons Valenzuela,Carlos Y Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
description	Background: Our previous studies have shown that the monthly rhythm of menarche is associated to the expectancy of holidays or vacations. If this hypothesis is true, menarche episodes in Chile should cluster in December, the month prior to summer vacations. Aim: To study whether the expectancy of holidays or vacations is the main determinant of the annual rhythm of menarche. Material and methods: During 1990 and 1991, a questionnaire about the date of birth and date of menarche, was applied to girls living in Santiago (Chile) and Medellin (Colombia), aged 8 to 18.5 years. They were requested to register the year, month or day of menarche, only if they recalled it precisely. Results: Discarding clerical errors, data was obtained from 3,225 Chilean and 3,435 Colombian girls. Of these 73 and 63% of Chilean and Colombian girls recalled the day of menarche. Among Chilean girls an excess of menarche episodes was observed in December, January and February. The mean age per month of menarche reached its highest value of 155.6±15 months in December and fell to 148±17 months in January (p <0.001). Among Colombian girls, mean age per month of menarche was also higher in December and lower in January (152±15 and 147±14 months respectively, p <0.001). However a peak of 152±15 months was also observed in June. Conclusions: A similar distribution of menarche episodes was observed among Chilean and Colombian girls, with a peak in the months preceding holidays. The influence of the photoperiod is unlikely since Medellin is located in parallel 6 and there are little variations in daylight exposure in the different seasons. Therefore, our data supports the hypothesis that the prospect of holidays is a determinant of menarche
author	Valenzuela,Carlos Y
author_facet	Valenzuela,Carlos Y
author_sort	Valenzuela,Carlos Y
title	Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
title_short	Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
title_full	Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
title_fullStr	Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
title_full_unstemmed	Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
title_sort	confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia
publisher	Sociedad Médica de Santiago
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872006000500009
work_keys_str_mv	AT valenzuelacarlosy confirmaciondelaexpectativavacacionestudiocomofactorprincipaldelritmoanualdeincidenciayedaddemenarquia
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Confirmación de la expectativa vacación-estudio como factor principal del ritmo anual de incidencia y edad de menarquia

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