Trends and seasonal variations in human secondary sex ratio in Southwest Nigeria: A 10-year survey

Fakorede, SamsonTaiwo; Ojo, S. Ade; Shonde, KikelomoMercy; Adekoya, KhalidOlajide; Ogunkanmi, LiasuAdebayo; Oboh, B. O.

doi:10.4103/aihb.aihb_165_21

Cited by 3 publications

(4 citation statements)

References 43 publications

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“…The term “secondary sex ratio” is intended to distinguish it from the primary sex ratio (PSR), which represents the sex ratio at conception. In human populations, the PSR is expected to be 1:1 based on the law of independent assortment of the X and Y chromosomes 12 . However, measuring the PSR at conception is challenging, leading to limited knowledge in this area 13 .…”

Section: Introductionmentioning

confidence: 99%

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Factors influencing sex ratio at birth in Krosno, Poland

Nieczuja-Dwojacka,

Marchewka-Długońska,

Budnik

et al. 2024

Sci Rep

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The secondary sex ratio (SSR) is a widely used descriptor that reflects the living conditions and health status during pregnancy. The aim of study was to assess the impact of maternal factors, season of birth, and air pollution with the heating season on the sex ratio at birth in the Subcarpathian population from the Krosno district, Poland. A retrospective study involving 11,587 births was occurred at the John Paul II Podkarpackie Province Hospital in Krosno between 2016 and 2020. Sex of the newborn, the season of their birth, as well as the maternal age, birth order, the interval between births, and the season of birth were analysed. Furthermore, the relationship between the SSR and the level of air pollution during the heating season was investigated. To determine the significance of differences in sex ratios, chi-square analysis and multifactorial regression were used, with a significance level set at p < 0.05. At the chi-square level, all the studied factors indicated a statistically significant relationship with the SSR. However, the regression model used shows that maternal age and birth order were the most important factors in shaping the SSR in the study group.

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Section: Introductionmentioning

confidence: 99%

“…Despite some reservations, the SSR is widely used in research as a measure of exposure to stressors during pregnancy 10 , 12 . Numerous studies have consistently shown an excess of male newborns among live births, which holds true for historical data as well 21 – 23 .…”

Section: Introductionmentioning

confidence: 99%

Factors influencing sex ratio at birth in Krosno, Poland

Nieczuja-Dwojacka,

Marchewka-Długońska,

Budnik

et al. 2024

Sci Rep

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“…Although the determination of the SSR and overall embryonic development was previously believed to be exclusively governed by intrinsic stimuli, contemporary research has revealed that external factors may also contribute to the modulation of these processes [ 3 , 4 , 5 ]. Specifically, seasonal variations, terrorism, wars, exposure to chemicals, infections, natural disasters, and nuclear accidents have all been recognized as potential trendsetters of the SSR [ 6 , 7 , 8 , 9 , 10 , 11 ]. Considering the effects of daily behaviors and habits on individuals’ reproductive health, there is a viable hypothesis that lifestyle choices may also influence the SSR [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Lifestyle on the Secondary Sex Ratio: A Review

Dermitzakis,

Theotokis,

Axarloglou

et al. 2024

Life

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The secondary sex ratio (SSR), indicating the ratio of male to female live births, has garnered considerable attention within the realms of reproductive biology and public health. Numerous factors have been posited as potential trendsetters of the SSR. Given the extensive research on the impact of daily behaviors and habits on individuals’ reproductive health, there is a plausible suggestion that lifestyle choices may also influence the SSR. By synthesizing the existing literature on the current research field, this comprehensive review indicates that an elevated SSR has been associated with an increased intake of fatty acids and monosaccharides, proper nutrition, higher educational levels, financial prosperity, and favorable housing conditions. On the other hand, a decreased SSR may be linked to undernutrition, socioeconomic disparities, and psychological distress, aligning with the Trivers–Willard hypothesis. Occupational factors, smoking habits, and cultural beliefs could also contribute to trends in the SSR. Our review underscores the significance of considering the aforementioned factors in studies examining the SSR and emphasizes the necessity for further research to unravel the mechanisms underpinning these connections. A more profound comprehension of SSR alterations due to lifestyle holds the potential to adequately develop public health interventions and healthcare strategies to enhance reproductive health and overall well-being.

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“…Despite some reservations, the SRB is widely used in research as a measure of exposure to stressors during pregnancy [10,12]. Numerous studies have consistently shown an excess of male newborns among live births, which holds true for historical data as well [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Impact of maternal factors and environmental stress on sex ratio in Southern Poland

Nieczuja-Dwojacka,

Marchewka-Długońska,

Budnik

et al. 2023

Preprint

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The secondary sex ratio (SRB) is a widely used descriptor that reflects the living conditions and health status during pregnancy. The aim of study was to assess the impact of maternal factors, season of birth, and air pollution with the heating season on the sex ratio at birth in the Subcarpathian population from the Krosno district. A retrospective study involving 11,587 births was occurred at the John Paul II Podkarpackie Province Hospital in Krosno between 2016 and 2020. Sex of the newborn, the season of their birth, as well as the maternal age, birth order, the interval between births, and the season of birth were analysed. Furthermore, the relationship between the SRB and the level of air pollution during the heating season was investigated. To determine the significance of differences in sex ratios, chi-square analysis and multifactorial regression were used, with a significance level set at p < 0.05. At the chi-square level, all the studied factors indicated a statistically significant relationship with the SRB. However, the regression model used shows that maternal age and birth order were the most important factors in shaping the SRB in the study group.

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Trends and seasonal variations in human secondary sex ratio in Southwest Nigeria: A 10-year survey

Cited by 3 publications

References 43 publications

Factors influencing sex ratio at birth in Krosno, Poland

Factors influencing sex ratio at birth in Krosno, Poland

The Impact of Lifestyle on the Secondary Sex Ratio: A Review

Impact of maternal factors and environmental stress on sex ratio in Southern Poland

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