Birth Seasonality in Yucatan, Mexico

Azcorra, Hugo; Vázquez‐Vázquez, Adriana; Méndez-Domínguez, Nina; Salazar-Rendón, Juan Carlos; Munguía-Rosas, Miguel A.; Banik, Sudip Datta

doi:10.1007/s10745-017-9910-9

Cited by 2 publications

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“…Another set of factors that has been studied in relation to seasonal variations in births is that which relates to different sociodemographic characteristics. Several studies have examined the impact of social class on the seasonal variation in births (Pasamanick et al , 1960; Zelnik, 1969; Erhardt et al , 1971; James, 1971; Chaudhury, 1972; Warren and Tyler, 1979; Bobak and Gjonca, 2001; Buckles and Hungerman, 2013; Azcorra et al , 2017). Most of these studies show that the seasonal variation in childbearing differs by the sociodemographic characteristics of the mother.…”

Section: Introductionmentioning

confidence: 99%

Changing seasonal variation in births by sociodemographic factors: a population-based register study

Dahlberg

Andersson

2018

Human Reproduction Open

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STUDY QUESTION Have seasonal variations in births by factors related to maternal education, age, parity and re-partnering changed over a 72-year period? SUMMARY ANSWER Seasonal variation in births has been reduced overall but also changed its pattern over the last seven decades. WHAT IS KNOWN ALREADY The number of births varies markedly by season, but the causes of this variation are not fully understood. Seasonality of births is, in some populations, strongly influenced by sociodemographic factors. STUDY DESIGN SIZE, DURATION A longitudinal study design was used by analysing the seasonal variation in live births between 1940 and 2012, and relating it to mothers’ sociodemographic characteristics at the time of childbirth (maternal education, age, parity and re-partnering). PARTICIPANTS/MATERIALS, SETTING, METHODS Register data on 6 768 810 live births in Sweden between 1940 and 2012 were used. Information on biological parents are available for more than 95% of all births. Multinomial logistic regressions were used to calculate predicted probabilities of giving birth for each calendar month. MAIN RESULTS AND THE ROLE OF CHANCE Between 1940 and 1999, Swedish birth rates showed the typical seasonal variation with high numbers of births during the spring, and low numbers of births during the last quarter of the year. However, during the 21st century, the seasonal variation in fertility declined so that only minor variation in birth rates between February and September now remains. Still, the pattern of low birth rates at the end of the year remains and has even become more pronounced from the 1980s onwards. The characteristic ‘Christmas effect’ that used to be visible in September has vanished over the last 30 years. The roles in seasonal variation of maternal education, the mother’s age, parity and instances where the mother has re-partnered between subsequent births changed during the second half of the 20th century. From 1980s onwards, the decline in birth rates during the last quarter of the year became particularly pronounced among highly educated mothers. Over the 72 years studied, the seasonal variation among first-time mothers declined steadily and has almost disappeared at the end of the study period. Using data that cover ~180 000 births in each month, all meaningful results are statistically significant. LIMITATIONS REASONS FOR CAUTION The study uses data from one Nordic country only, making it difficult to draw conclusions that may hold for other countries. WIDER IMPLICATIONS OF THE FINDINGS The typical seasonal variation reported for Sweden between 1940 and 1999, with high numbers of births during the spring and low numbers of births during the last quarter of the year, is in line with results from most other European countries during the same time period. However, the s...

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Section: Introductionmentioning

confidence: 99%

Changing seasonal variation in births by sociodemographic factors: a population-based register study

Dahlberg

Andersson

2018

Human Reproduction Open

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“…Additionally, no matter what the overall seasonal pattern was, high educated women, married and pregnant with their second child showed higher birth rates during the spring and a pattern of depressed birth rates in November and December also in Sweden (Dahlberg & Andersson, 2018 ), Czech Republic (Bobak & Gjonca, 2001 ), Mexico (Azcorra et al, 2017 ) and Iran (Khajavi et al, 2016 ). Also in France and Holland the dates of birth for second children appear to be planned often in the spring (Prioux, 1988 ).…”

Section: Discussionmentioning

confidence: 99%

Influence of sociodemographic factors in birth seasonality in Spain

Alcaide

López

Bolúmar

2022

American J Hum Biol

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Objectives: The goal of the present research is to establish for the first time a hierarchy of sociodemographic factors according to their importance influencing birth seasonality. Methods: We used Vital Statistics data on all births registered in Spain in the period 2016-2019. Differences in the degree of seasonality between sociodemographic groups (defined by maternal age, maternal marital status, maternal education, birth order, maternal job qualification, maternal employment status, maternal location population size, and maternal country of birth) were first examined with descriptive techniques. Secondly, analysis through alternative Data Mining techniques determined the association between sociodemographic factors and birth seasonality and the factors importance rank.Results: Those factors related to maternal labor status (employment status, job qualification, and education) were found to be the most relevant influencing birth seasonality. It was found that the overall seasonal pattern in Spain was driven by lower skilled employed mothers, in contrast with not employed or high skilled employed mothers, who showed a different or weaker seasonality. Finally, we found that a change in the rhythm pattern has taken place in the last decades in Spain.Conclusions: Birth seasonality is to a large extent related to maternal employment status. Employed mothers, normally more affected by the seasonality of work calendar than the unemployed, show higher conception rates structured around holidays. This may indicate that the observed change of seasonal pattern in Spain in the last decades, as in other European countries, may be specifically driven by the progressive higher participation of women in labor market.

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Birth Seasonality in Yucatan, Mexico

Cited by 2 publications

References 20 publications

Changing seasonal variation in births by sociodemographic factors: a population-based register study

Changing seasonal variation in births by sociodemographic factors: a population-based register study

Influence of sociodemographic factors in birth seasonality in Spain

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