DOI: http://dx.doi.org/10.18203/2320-1770.ijrcog20180900

The effect of seasonal variation on the delivery rate: a retrospective study

Reena Pal, Nikita Gandotra

Abstract


Background: We are living in a second most populated country in the world where many social, cultural and ecological processes and events occur regularly every year. These seasonal processes influence many vital rates including birth rates. The objective of this study was to assess the effect of seasonal variation on the delivery rate in tertiary care centre.

Methods: A retrospective descriptive study carried out in Government Doon Medical College Dehradun. We extracted total number of delivery over five years period from hospital records (2012-2016) and analyzed the figures for monthly variation in delivery rates. This was repeated for a standardized 30-day month and the findings compared.

Results: The total number of deliveries during the study period were 43,892 with an average of 3,657 deliveries per month. The highest rate of delivery was in the August month and lowest one was in the month of April. The monthly distribution of delivery rate also showed sinusoidal pattern.

Conclusions: There is significant seasonal variation in monthly distribution of delivery rate. There are maximum conception rates are in winter season and minimum conception is in summer season. These findings will prove valuable in health system planning and in the interpretation of seasonal variations in other reproductive parameters.


Keywords


Delivery rate, Monthly variation, Seasonal variation

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References


Dorélien AM. A time to be born: birth seasonality in sub-Saharan Africa. University of Michigan Population Studies Center Research Report Series Report. 2013;13(785):1-61.

Eskandar M, Archibong E, Sadek A, Sobande A. Ectopic pregnancy and seasonal variation: a retrospective study from the south western region of Saudi Arabia. Bahrain Med Bull. 2002;24:63-5.

Goldenberg M, Bider D, Seidman DS, Lipitz S, Mashiach S, Oelsner G. Seasonal pattern in tubal pregnancy. Gynecol Obstet Invest. 1993;35:149-51.

Warren CW, Gld J, Tyler CW, Smith JC, Allen L. Seasonal variation in spontaneous abortions. Am J Public Health. 1980;70:1297-9.

Okafor UV, Efetie RE, Ekumankama O. Eclampsia and seasonal variation in the tropics: a study in Nigeria. Pan Afr Med J. 2009;2:7.

Etard JF, Kodio B, Ronsmans C. Seasonal variation in direct obstetric mortality in rural Senegal: role of malaria? Am J Trop Med Hyg. 2003;68:503-4.

Ayani O. Seasonal variation of birth in rural Southwestern Nigeria. Int J Epidemiol. 1986;15:91-6.

Mathers CD, Harris RS. Seasonal distribution of births in Australia. Int J Epidemiol. 1983;12:326-31.

Halil SS. The seasonality of births in Canada. J Biosoc Sci. 1989;21:321-7.

Erhardat CL, Nelson FG, Pakter J. Seasonal patterns of conception in New York City. Am J Public Health. 1971;61:2246-58.

Becker S. Seasonal patterns of births and conception throughout the world. Adv Exp Med Biol. 1991;286:59-72.

Roenneberg T, Aschof J. Annual rhythm of human reproduction: I. Biology, sociology, or both? J Biol Rhythms. 1990;5(3):195-216.

Yadava KN, Dube D, Marwah SM. A study of seasonal trends in delivery and medical termination of pregnancy. J Obst Gynaecol India. 1979;29:256-7.

Lam DA, Miron JA. Global patterns of seasonal variation in human fertility. Ann N Y Acad Sci. 1994;709:9-28.

Lam DA, Miron JA. The effects of temperature on human fertility. Demograph. 1996;33(3):291-305.

Martin JA, Hamilton BE, Ventura SJ, Menacker F, Park MM. Births: final data for 2000. National vital statistics report. Hyattsville, Maryland: National Center for Health Statistics. 2002;50:8,45.

Levine RJ. Seasonal variation of semen quality and fertility. Scand J Work Environ Health. 1999;25(1):34-7.

Thonneau P, Bujan L, Multigner L, Mieusset R. Occupational heat exposure and male fertility: a review. Hum Reprod. 1998;13(8):2122-5.

Enabudoso EJ, Okpighe AC, Gharoro EP, Okpere EE. Delivery rate in Benin City, Nigeria: are there seasonal variations?. Nigerian J Clin Pract. 2011;14(2):129-31.

Bronson FH. Are humans seasonally photoperiodic? J Biol Rhythms. 2004;19(3):180-92.

Paonnenberg T, Aschoff J. Annual rhythms of human reproduction and environmental correlations. J Biol Rhythms. 1990;5:217-39.