Effect of Different Seasons on Pregnancy Gender Outcome in Sample of Iraqi Women
Asian Journal of Research in Nursing and Health,
Background: Sex ratio is important for human life since its creation, some families prefer male than females, also its related to some medical problems that affect certain sex than another. Studies showed that males are more fragile, and might die earlier than females. Climate has a certain effect on male to female ratio of the pregnancy outcome and certain seasons are in favor of male than female reproduction.
Objectives: To evaluate the effect of climate and seasonal variation on the sex of live births in a sample of pregnant Iraqi women.
Subjects and Methods: This study was carried out on 2424 live babies (apart from 225 miscarriages) of women attending Al–Numan teaching hospital and Al-Husaynia health care center, from January 2017 till January 2019.The time of last menstrual period recall was taken from each mother of this study. an early ultrasound test was done to confirm the accuracy of pregnancy duration. The gender of live babies, maternal age and parity were recorded.
Results: The highest birth rate were in Autumn (721) then Winter (662), Spring (577) and the least in summer (521).
The male to female ratio increased with maternal age. Mothers of 30 years and over have 1.09male female ratio as compared with those under the age of 30 years (0.929).
The male female ratio was highest in Autumn 1.06 compared with other seasons; 0.97, 0.9233, 0.887 Winter, Spring and Summer respectively. The abortion rate was only (0.09) from total births.
Conclusion: The best season for conception in Iraq was Autumn. The total male female ratio regardless the season was 0.9659. The male female ratio was best in Autumn then Winter, Spring, lastly Summer. Sex differences shows that; males are conceived in seasons of more favorable conditions for reproduction.
- Birth rate
- Iraqi women
- maternal age
- sex ratio
How to Cite
Astolfi P, Zonta LA. Reduced male births in major Italian cities: Human Reproductio.1999;14:3116–3119.
Mocarelli P, Gerthoux PM, Ferrari E, Patterson DJ, Kieszak SM, Brambilla P, et al. Paternal concentration of dioxin and sex ratio of offspring: Lancet. 2000;355: 1858–1863.
Fukuda M, Fukuda K, Shimizu T, Andersen CY, Byskov AG. Parental peri conceptional smoking and male: female ratio of newborn infants: Lancet. 2002;359:1407–1408.
Orvos H, Kozinszky Z, Bartfai G. Natural variation in the human sex ratio. Hum. Reprod. 2001;16:803.
Nicolich MJ, Huebner WW, Schnatter RA. Influence of parental and biological factors on the male birth fraction in the United states: an analysis of birth certificate data from 1964 through 1988: Fertil. Steril. 2000;73:487 –492.
Cagnacci A, Volpe A. Influence of melatonin and photoperiod on animal and human reproduction: J. Endocrinol. Invest. 1996;19 :382 –411.
Melnikov VN, Grech V. Seasonality of live birth sex ratio in south western Siberia, Russia, 1959–2001: J. Epidemiol. Community Health, 2003;57: 471–472.
James, W.H. Why are boys more likely to be preterm than girls? Plus other related conundrums in human reproduction: Hum. Reprod. 2000;15: 2108 –2111.
James W.H. Interpregnancy intervals, high maternal age and seasonal effects on the human sex ratio. Hum. Reprod. 1996;11:7–8.
Tong J, Sheng S, Sun Y, Li H, Li WP, Zhang C.et al. Melatonin levels in follicular fluid as markers for IVF outcomes and predicting ovarian reserve: Reproduction. 2017;153: 443–451.
Shavi Fernando, LukRombauts. Melatonin: shedding light on infertility? - a review of the recent literature: J .ovarian Res. 2014;7:98.
Javier Espino, MaríaMacedo, Graciela Lozano, Águeda Ortiz , Carmina Rodríguez , Ana B. et al. Impact of Melatonin Supplementation in Women with Unexplained Infertility Undergoing Fertility Treatment: Antioxidants. 2019; 8:338.
Zhang HM, Zhang Y. Melatonin: A well-documented antioxidant with conditional pro-oxidant actions: J. Pineal Res. 2014;57:131–146.
Chao Song, Wei Peng, Songna Yin, Jiamin Zhao, Beibei Fun , Jingcheng Zhang, et al . Melatonin improves age-induced fertility decline and attenuates ovarian mitochondrial oxidative stress in mice =: www.nature.com/ Scientific Reports. 2016; 1- 15.
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