Khajavi Alireza, Pishgar Farhad, Parsaeian Mahboubeh, Moghaddam Sahar Saeedi, Jeddian Alireza, Bahrami-Taghanaki Hamid Reza, Jamshidi Hamid Reza, Naderimagham Shohreh
Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran; Non-Communicable Diseases Research Center, Endocrinology and Metabolism Population Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran; Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran.
Ann Epidemiol. 2016 Dec;26(12):846-852.e3. doi: 10.1016/j.annepidem.2016.09.009. Epub 2016 Oct 4.
We conducted this study to investigate birth seasonality in rural parts of Iran.
In this study, patterns of 5,536,262 live births in rural parts of Iran between 1992 and 2007 were studied. Information about birth numbers, environmental factors, and sociocultural status of participants was obtained from previous works. Visually inspecting the seasonal variation of birth, studying its trend using autocorrelation analysis, examining the trend of birth seasonality using the seasonality coefficient, a newly introduced index, studying correlations between birth seasonality and possible associated factors, and analyzing associations between these variables and birth seasonality using multiple regression model were performed in this study.
In this study, we showed birth seasonality in rural parts of Iran, with the highest births in the first two seasons, winter and spring, mostly before the year of 2002. Latitude and mean temperature of districts, wealth status of families, education of women, and mothers' ages were associated with birth seasonality. However, latitude, temperature, and mothers' ages lost their associations after adjusting for sociocultural factors in the regression model.
Birth numbers in rural areas of Iran follow a rhythmic seasonal pattern; however, the ordering of seasons changes in the last years of the study period.
我们开展这项研究以调查伊朗农村地区的出生季节性。
在本研究中，对1992年至2007年伊朗农村地区5536262例活产的模式进行了研究。关于出生人数、环境因素以及参与者社会文化状况的信息取自先前的研究。本研究通过直观检查出生的季节性变化、使用自相关分析研究其趋势、使用新引入的季节性系数检查出生季节性趋势、研究出生季节性与可能相关因素之间的相关性以及使用多元回归模型分析这些变量与出生季节性之间的关联来展开。
在本研究中，我们显示伊朗农村地区存在出生季节性，在前两个季节（冬季和春季）出生人数最多，主要是在2002年之前。地区的纬度和平均温度、家庭财富状况、女性教育程度以及母亲年龄与出生季节性相关。然而，在回归模型中对社会文化因素进行调整后，纬度、温度和母亲年龄失去了它们的相关性。
伊朗农村地区的出生人数遵循有节奏的季节性模式；然而，在研究期的最后几年季节顺序发生了变化。
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