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https://www.readbyqxmd.com/read/28434430/studies-of-the-seasonal-pattern-of-multiple-maternities
#1
Johan Fellman
The seasonality of population data has been of great interest in demographic studies. When seasonality is analyzed, the population at risk plays a central role. In a study of the monthly number of births and deaths, the population at risk is the product of the size of the population and the length of the month. Usually, the population can be assumed to be constant, and consequently, the population at risk is proportional to the length of the month. Hence, the number of cases per day has to be analyzed. If one studies the seasonal variation in twin or multiple maternities, the population at risk is the total number of monthly confinements, and the study should be based on the rates of the multiple maternities...
April 24, 2017: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
https://www.readbyqxmd.com/read/28434024/chaotic-dynamics-in-the-seasonally-forced-sir-epidemic-model
#2
Pablo G Barrientos, J Ángel Rodríguez, Alfonso Ruiz-Herrera
We prove analytically the existence of chaotic dynamics in the forced SIR model. Although numerical experiments have already suggested that this model can exhibit chaotic dynamics, a rigorous proof (without computer-aided) was not given before. Under seasonality in the transmission rate, the coexistence of low birth and mortality rates with high recovery and transmission rates produces infinitely many periodic and aperiodic patterns together with sensitive dependence on the initial conditions.
April 22, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28430521/perinatal-light-imprinting-of-circadian-clocks-and-systems-pliccs-a-signature-of-photoperiod-around-birth-on-circadian-system-stability-and-association-with-cancer
#3
Philip Lewis, Thomas C Erren
Recent findings from animal models suggest that plasticity of human circadian clocks and systems may be differentially affected by different paradigms of perinatal photoperiod exposure to the detriment of health in later life, including cancer development. Focusing on the example of cancer, we carry out a series of systematic literature reviews concerning perinatal light imprinting of circadian clocks and systems (PLICCS) in animal models, and concerning the risk of cancer development with the primary determinants of the perinatal photoperiod, namely season of birth or latitude of birth...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28430011/demographics-of-hip-dysplasia-in-the-maine-coon-cat
#4
Randall T Loder, Rory J Todhunter
Objectives The aim of this study was to study the demographics of feline hip dysplasia (FHD) in the Maine Coon cat. Methods The complete hip dysplasia registry (public and private) collected by the Orthopedic Foundation for Animals through April 2015 was accessed. There were 2732 unique cats; 2708 (99.1%) were Maine Coons, and only these were studied. Variables analyzed were sex, month/season of birth and hip dysplasia score. Two groups were created: those with and without FHD. P <0.05 was considered statistically significant...
April 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/28429909/association-between-maternal-vitamin-d-status-during-pregnancy-and-offspring-cognitive-function-during-childhood-and-adolescence
#5
Sargoor R Veena, Ghattu V Krishnaveni, Krishnamachari Srinivasan, Kotrangada P Thajna, Bhavya G Hegde, Catharine R Gale, Caroline Hd Fall
BACKGROUND AND OBJECTIVES: Animal studies have demonstrated poor cognitive outcomes in offspring in relation to maternal vitamin D deficiency before and/or during pregnancy. Human studies linking maternal vitamin D status during pregnancy with offspring cognitive function are limited. We aimed to test the hypothesis that lower maternal vitamin D status during pregnancy is associated with poor offspring cognitive ability in an Indian population. METHODS AND STUDY DESIGN: Cognitive function was assessed in children from the Mysore Parthenon birth cohort during childhood (age 9-10 years; n=468) and adolescence (age 13-14 years; n=472) using 3 core tests from the Kaufman Assessment Battery for children and additional tests measuring learning, long-term retrieval/ storage, short-term memory, reasoning, verbal fluency, visuo-spatial ability, and attention and concentration...
May 2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28426385/birth-in-winter-can-reduce-the-risk-of-lung-cancer-a-retrospective-study-of-the-birth-season-of-patients-with-lung-cancer-in-beijing-area-china
#6
Yu Hao, Long Yan, ErQinFu Ke, Hong Wang, Juan He
The season of birth is an important risk factor for several diseases. We explored the relationship between birth season and lung cancer. In this population-based retrospective study, we focused on patients with lung cancer who had registered at the Beijing Institute for Cancer Research from 2003 to 2012. In total, 33,025 patients were divided into five subgroups based on their histologic classification, and these five subgroups were compared with the general population (i.e., the permanent resident population of Beijing in 2013)...
2017: Chronobiology International
https://www.readbyqxmd.com/read/28398620/high-ratios-of-c20-4n-6-c20-5n-3-and-thromboxane-b2-6-keto-prostaglandin-f1%C3%AE-in-placenta-are-potential-risk-contributors-for-neural-tube-defects-a-case-control-study-in-shanxi-province-china
#7
Kelei Li, Xiaotian Zhang, Lijun Pei, Gong Chen, Jianmeng Liu, Mark L Wahlqvist, Xiaoying Zheng, Duo Li
BACKGROUND: Neural tube defects (NTDs) are severe congenital malformations. Folate supplementation can reduce the risk, but cannot prevent all NTDs, suggesting other reasons for folate-resistant NTDs. The present study assesses placental fatty acid composition, eicosanoids, and cytokines as risk factors for NTDs in a Chinese population with highly incident NTDs. METHODS: Seventy-seven aborted fetuses with NTDs during the third trimester were cases and 142 healthy newborns were controls...
March 24, 2017: Birth Defects Res
https://www.readbyqxmd.com/read/28393739/prenatal-exposure-to-vitamin-d-from-fortified-margarine-and-risk-of-fractures-in-late-childhood-period-and-cohort-results-from-222-000-subjects-in-the-d-tect-observational-study
#8
Mina Nicole Händel, Peder Frederiksen, Clive Osmond, Cyrus Cooper, Bo Abrahamsen, Berit L Heitmann
Prenatal low vitamin D may have consequences for bone health. By means of a nationwide mandatory vitamin D fortification programme, we examined the risk of fractures among 10-18-year-old children from proximate birth cohorts born around the date of the termination of the programme. For all subjects born in Denmark during 1983-1988, civil registration numbers were linked to the Danish National Patient Registry for incident and recurrent fractures occurring at ages 10-18 years. Multiplicative Poisson models were used to examine the association between birth cohort and fracture rates...
April 10, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28393128/prevalence-and-predictors-of-mental-health-among-farmworkers-in-southeastern-anatolia-of-turkey
#9
Zeynep Simsek, Ayşana Zehra Keklik, Canan Demir, Kerim M Munir
BACKGROUND: Mental health problems represent a major component of the global burden of disease. The primary objective of this study was to assess the prevalence and predictors of psychological wellbeing among farmworkers and to evaluate their mental health services need for in rural primary health care settings. METHODS: The study sample comprised 1855 farmworkers (918 women, and 937 men) who were selected using probability cluster sampling method at 95% confidence interval (87...
January 2017: Int J Environ Agric Res
https://www.readbyqxmd.com/read/28390294/season-of-birth-and-schizophrenia-evidence-from-china
#10
Cuntong Wang, Yudong Zhang
Controversies exist whether season of birth is associated with schizophrenia development later in life, and evidence has mainly come from studies done in developed countries. This study examines the association between season of birth and risk for schizophrenia in China, with special attention to geographical region, urbanity, and gender. Using data from China's Second National Sampling Survey on Disability, a large-scale, nationally representative sample (N=2,052,694), this study employs discrete-time hazard models to compare the risk for schizophrenia development for people born in different seasons, and conducts subsample analyses by geographical region, urbanity, and gender...
March 28, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28389128/season-dependent-concentrations-of-urinary-phthalate-metabolites-among-chinese-pregnant-women-repeated-measures-analysis
#11
Hui Gao, Yuan-Duo Zhu, Yuan-Yuan Xu, Yun-Wei Zhang, Hui-Yuan Yao, Jie Sheng, Zhong-Xiu Jin, Ling-Ling Ren, Kun Huang, Jia-Hu Hao, Fang-Biao Tao
In utero exposure to phthalates may have adverse effects on pregnant women and their offsprings. Therefore, the exposure level of these substances among individuals, particularly among sensitive population, is of concern. The objective of the present study is to characterize urinary concentrations of phthalate metabolites at multiple time points during pregnancy in Chinese women. A total of 3455 pregnant women were included from Ma'anshan Birth Cohort in China. Spot urine samples in the morning (8:00-10:00) and questionnaires were obtained at three separate visits (approximately in 10, 26, and 34 gestational weeks)...
April 4, 2017: Environment International
https://www.readbyqxmd.com/read/28386583/the-demographics-of-canine-hip-dysplasia-in-the-united-states-and-canada
#12
Randall T Loder, Rory J Todhunter
Canine hip dysplasia (CHD) is a common problem in veterinary medicine. We report the demographics of CHD using the entire hip dysplasia registry from the Orthopedic Foundation for Animals, analyzing differences by breed, sex, laterality, seasonal variation in birth, and latitude. There were 921,046 unique records. Each dog was classified using the American Kennel Club (AKC) and Fédération Cynologique Internationale (FCI) systems. Statistical analysis was performed with bivariate and logistic regression procedures...
2017: Journal of veterinary medicine
https://www.readbyqxmd.com/read/28384281/month-of-birth-and-level-of-insolation-as-risk-factors-for-multiple-sclerosis-in-poland
#13
Paweł Dobrakowski, Michał Bogocz, Kamil Cholewa, Mateusz Rajchel, Katarzyna Kapica-Topczewska, Sławomir Wawrzyniak, Halina Bartosik-Psujek, Alina Kułakowska, Dorota Koziarska, Monika Adamczyk-Sowa
INTRODUCTION: Many studies have shown that people born in the spring are at a higher risk of developing multiple sclerosis (MS). This may be associated with lower levels of sun exposure, and consequently, lower levels of vitamin D3 during pregnancy. However, these relationships have not been verified thus far in any countries in Central Europe. OBJECTIVE: The aim of our study was to determine the frequency distribution of births for each calendar month in patients suffering from MS in Poland...
2017: PloS One
https://www.readbyqxmd.com/read/28373965/perinatal-light-imprinting-of-circadian-clocks-and-systems-pliccs-the-pliccs-and-cancer-hypothesis
#14
Philip Lewis, Thomas C Erren
Circadian disruption is associated with sleep, mood, and metabolic disorders, and-according to the International Agency for Research on Cancer-even with cancer. Mechanistically, the source of disease may be circadian system instability which likely arises during development. In animal experiments, both low perinatal light:dark ratios and chronic perinatal photoperiod phase shifting yield enduring, detrimental effects on neuroendocrine physiology via circadian system instability. Certainly, accumulating disturbances to neuroendocrine physiology and detrimental downstream effects could predispose to internal cancers...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28368456/interference-between-respiratory-syncytial-virus-and-human-rhinovirus-infection-in-infancy
#15
Niek B Achten, Pingsheng Wu, Louis Bont, Maarten O Blanken, Tebeb Gebretsadik, James D Chappell, Li Wang, Chang Yu, Emma K Larkin, Kecia N Carroll, Larry J Anderson, Martin L Moore, Chantel D Sloan, Tina V Hartert
Background.: Respiratory syncytial virus (RSV) and human rhinovirus (HRV) are the most common viruses associated with acute respiratory tract infections in infancy. Viral interference is important in understanding respiratory viral circulation and the impact of vaccines. Methods.: To study viral interference, we evaluated cases of RSV and HRV codetection by polymerase chain reaction in 2 prospective birth cohort studies (the Infant Susceptibility to Pulmonary Infections and Asthma Following RSV Exposure [INSPIRE] study and the Tennessee Children's Respiratory Initiative [TCRI]) and a double-blinded, randomized, controlled trial (MAKI), using adjusted multivariable regression analyses...
March 24, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28343772/report-of-the-who-technical-consultation-on-the-effect-of-maternal-influenza-and-influenza-vaccination-on-the-developing-fetus-montreal-canada-september-30-october-1-2015
#16
Deshayne B Fell, Zulfiqar A Bhutta, Jennifer A Hutcheon, Ruth A Karron, Marian Knight, Michael S Kramer, Arnold S Monto, Geeta K Swamy, Justin R Ortiz, David A Savitz
In 2012, the World Health Organization (WHO) released a position paper on influenza vaccination recommending that pregnant women have the highest priority for seasonal vaccination in countries where the initiation or expansion of influenza immunization programs is under consideration. Although the primary goal of the WHO recommendation is to prevent influenza illness in pregnant women, the potential benefits of maternal immunization in protecting young infants are also recognized. The extent to which maternal influenza vaccination may prevent adverse birth outcomes such as preterm birth or small-for-gestational-age birth, however, is unclear as available studies are in disagreement...
March 23, 2017: Vaccine
https://www.readbyqxmd.com/read/28340910/birth-seasonality-in-rural-areas-of-iran-analysis-of-5-536-262-births-from-1992-to-2007
#17
Alireza Khajavi, Farhad Pishgar, Mahboubeh Parsaeian, Sahar Saeedi Moghaddam, Alireza Jeddian, Hamid Reza Bahrami-Taghanaki, Hamid Reza Jamshidi, Shohreh Naderimagham
PURPOSE: We conducted this study to investigate birth seasonality in rural parts of Iran. METHODS: 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...
December 2016: Annals of Epidemiology
https://www.readbyqxmd.com/read/28338933/seasonality-of-birth-for-skin-melanoma-deserves-further-investigation
#18
F Stracci, A Liso, E Duca, F La Rosa, F Bianconi
No abstract text is available yet for this article.
March 14, 2017: International Journal of Epidemiology
https://www.readbyqxmd.com/read/28338928/reply-to-seasonality-of-birth-for-skin-melanoma-deserves-further-investigation
#19
Olaf Gefeller, Cornelia Fiessler, Martin Radespiel-Tröger, Annette B Pfahlberg, Wolfgang Uter
No abstract text is available yet for this article.
March 14, 2017: International Journal of Epidemiology
https://www.readbyqxmd.com/read/28336268/malaria-incidence-during-early-childhood-in-rural-burkina-faso-analysis-of-a-birth-cohort-protected-with-insecticide-treated-mosquito-nets
#20
Sabrina Wehner, Gabriele Stieglbauer, Corneille Traoré, Ali Sie, Heiko Becher, Olaf Müller
BACKGROUND: Even in the high transmission areas of sub-Saharan Africa (SSA), the incidence of falciparum malaria varies greatly depending on factors such as age, rainfall pattern, distance to breeding places, quality of houses, and existing vector control measures. Insecticide-treated mosquito nets (ITN) have now become the vector control standard in nearly all of SSA. This study aims to describe and analyse the incidence of malaria in a cohort of young children protected with ITN in rural West Africa...
March 20, 2017: Acta Tropica
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