جستجوی مقالات مرتبط با کلیدواژه « season » در نشریات گروه « پزشکی »

Infertility and its individual and social problems are considered as one of the important problems of couples. About half of all infertility is due to male factors. Based on various studies, air temperature can affect male fertility, so the present study was conducted aimed to determine the amount of sperm DNA fragmentation of men referring to Umm Al-Banin Infertility Center in Dezful by different seasons.

In this retrospective study, the statistical population included all men who referred to the infertility center in Dezful for semen analysis between 2013 and the first half of 2020. Information about the variables including age, number of children, job, education, diseases, addiction, different seasons and sperm DNA fragmentation was collected by the researcher using a checklist. Data were analyzed using SPSS statistical software (version 24) and Chi-square and one-way ANOVA tests. P<0.05 was considered statistically significant.

No significant relationship was found between sperm DNA fragmentation and different age groups, number of children, types of occupations, level of education, underlying diseases, addiction and finally different seasons and months of the year (P> 0.05).

According to the results, there is no relationship between different seasons and sperm DNA fragmentation in men.

birth body size is an indicator of intrauterine growth and important in later health. this study was performed to assess seasonal variation of birth body size in a group of Iranian newborn.

in a retrospective design, Hospital records of 2034 of singleton newborn with gestational age >37 week and no malformation or neonatal disorder, was assessed sex delivery type birth month, birth weight, birth height, head and chest circumferences was extracted.

1038 cases (51%)of neonates were male and 692 cases (34%) born in natural vaginal delivery. no significant difference was found in seasonal mean of birth weight (p=0.285) although most mean off birth weight was in Winter and least in summer. but peak of birth height was in fall and the least in summer (mean difference: 0.40; 95% CI:0.06-0.74; p=0.013). the difference between mean of birth head circumference was significant(p=0.027) and the most mean was in Winter and least in summer (mean difference : 0.24;95% CI:0.02-0.46; p=0.030). the difference between mean of birth chest circumference was significant and the most and least mean was in fall and spring; respectively (mean difference: 0.42;95% CI:0.12-0.71; p=0.002).

birth body size is the least in newborn of  hot half of the year and most in cold holf of the year.

 Inflammatory bowel disease (IBD) is a group of diseases that cause inflammation of the walls of the large intestine and small intestine, the most common of which are ulcerative colitis and Crohn's disease. There are similarities in that both diseases cause inflammation of the intestinal wall, although there are many differences in the areas involved and the depth of inflammation between the two diseases. There are many similarities in the treatment plan for the two diseases. It is important to note that Crohn's disease, in addition to affecting the large intestine and small intestine, can also affect the esophagus, esophagus, stomach, and anus, while ulcerative colitis primarily affects the colon and rectum. Affects the intestines. It is hypothesized that IBD is more likely to occur in genetically predisposed individuals in environmental exposures that are associated with abnormal immune responses. While several environmental factors have been raised, there are many differences regarding the role of these potential factors (1, 3). It seems that in the last few decades due to the type of nutrition (which is one of the environmental factors) such as increasing consumption of cow's milk in infants instead of breast milk, increasing consumption of sugar, sweets, high fat consumption, reducing fiber consumption , The world has been associated with an increase in IBD. The incidence and prevalence of IBD is increasing in the world and has become common in Iran in the last 30 years. Inflammatory bowel disease is among the most common diseases increasing rapidly in some countries and Iran, especially in Gilan. Approximately 30000 cases of IBD have been recorded at Gilan Gastroenterology and Liver Research Center. It seems that genetic and environmental factors to be involved in this disease. The objective of this study is to investigate the relationship between environmental factors and the geographical distribution of inflammatory bowel disease (IBD) in Gilan province. The incidence of inflammatory bowel disease varies from region to region. The disease is more common in industrialized countries. The number of patients with this disease in Iran is close to 10,000. In Gilan province, a large number of about 3,000 people suffer from this disease. Therefore, the purpose of this paper is to investigate the relationship between contextual variables and frequency of inflammatory bowel disease (IBD) in Gilan province. With these details, the aim of this paper is to investigate the relationship between contextual variables and climatic elements with the prevalence of inflammatory bowel disease (IBD) in Gilan province.

 This research is applied in terms of purpose and in terms of library-field-to-field data collection tools. The volume of information on the prevalence of IBD disease registered in the Digestive and Liver Research Center of Razi Hospital Research and Training Center in Rasht Hospital in Gilan Province was from 2016-2017. Demographic characteristics, city of residence, types of inflammatory bowel disease with separation of ulcerative colitis and Crohn's disease and sex and climatic elements (humidity, temperature, pressure and rainfall) as independent variables and IBD disease as dependent variables. Descriptive statistics and Chi Square statistical test were used at a significance level of p <% 5 using SPSS software to analyze the data.

 The highest number of patients with inflammatory bowel disease - colitis based on the month of diagnosis of the disease in the city with 44 people (77.2%) and the lowest in September with 2 people (100%). The highest number of patients with colitis-men in summer with 41 patients (21.6%), the lowest number of colitis-men in spring with 4 patients (2.1%). The highest number of patients with colitis- Women in summer with 47 patients (24.7%), the lowest colitis-women in the fall with 7 patients (3.7%). There was a significant correlation in terms of correlation (p value = 0.01). According to Chi Square statistical test, there was no significant statistical difference between patients 'birth months, patients' hometowns and Crohn's disease and ulcerative colitis (p <0.05). In 6 cities, there was no significant relationship between the total number of patients, male and female patients with climatic elements: humidity, temperature, pressure and rainfall. From this study, the following results are obtained: Seasonal changes in patients with IBD by gender during the years 2016-2017 from 190 patients were done. The highest number of patients crohn -men in summer with 10 patients (5.3%), the lowest crohn -male statistics in winter and autumn with 2 patients (1.1%), the highest number of crohn -female patients in summer with 9 patients (4.7%) and the lowest crohn -female statistics in autumn with 1 patient (0.5%), there was no significant correlation (p = 0.5).

 In a study conducted by Stein et al. In 2016, the effect of geographical location, season and UV exposure on disease severity was measured by measuring the rate of hospital discharge of IBD patients nationwide. IBD hospitalization rates in the northern states were higher than in the southern states for both ulcerative colitis and Crohn's disease. However, there was no uniform difference between IBD admission rates by season versus study years. UV index was inversely related, although it was not proportional to the rate of discharge for both Crohn's disease and ulcerative colitis (11). The highest number of patients with inflammatory bowel disease was based on the month of diagnosis in the years between 2016-2017 in September with 57 people and the lowest in October with 2 people. The highest number of patients with inflammatory bowel disease based on the month of diagnosis in September with 11 people (8.5%) and summer with 13 people (22.8%) and the lowest in July, October and March with 0 people (0%). The highest number of patients with inflammatory bowel disease-colitis based on the month of diagnosis was in September with 44 patients (77.2%) and the lowest was in October with 2 patients (100%). However, there was no significant relationship in terms of correlation (p value = 0.9). It can be concluded that studies by scientists and researchers have confirmed the effect of climate change on the body's natural reactions based on the season and month of birth. Accordingly, any minor changes in air temperature, pressure and humidity can cause changes in behavior and physical and mental conditions of individuals.

Some of the causes of preterm delivery almost are known but its biological mechanisms are unknown. There is evidence that shows preterm delivery is related with different seasons of the year. Finding environmental factors affecting biological mechanisms is important steps to reduce preterm delivery. This study aims to determine the seasonal distribution of preterm delivery in Ardabil County.
Material & This research has been done as a descriptive-analysis with a retrospective approach, using hospital cases and climatic data at Sabalan hospital in Ardabil County has analysed 759 pregnant women (n= 10860) who had preterm delivery complication during the weeks 20-36 over the time from March 2011-Feburury 2016. In this study, statistical data analysis using descriptive statistical methods and correlation relations were carried out by SPSS software 20.
There were% 6.98 preterm delivery among 10860 natural birth. Maximum preterm delivery outbreak was in winter (% 7.95) (P Preterm delivery followed seasonal pattern according to research findings in Ardabil County.

Aflatoxins are of the highly toxic metabolites, produced by different species of aspergillums causing Immunosuppressive, mutagenic, teratogenic, and carcinogenic effects. The major aim of this study is to evaluate the concentration of aflatoxin M1 in breast milk in Yazd in summer and winter 2013.
This is a cross-sectional study. During summer and winter 2013, samples from 80 mothers referring to health centers of Yazd were obtained. ELISA was used to measure aflatoxin M1.
From total number of 80 samples, 6 cases (7.5%) were contaminated with aflatoxin M1. Contamination rate was significantly higher in winter comparing to summer (P0.05).
According to the results of this study, it can be concluded that to reduce the risk of aflatoxin, it is necessary to educate the woman living in Yazd to sources of this toxin.

Preterm delivery is a complicated situation that its risk factors are different based on different seasons. One of the environmental factors which may be effective on the occurrence of preterm delivery is season. This study was conducted with aim to investigate seasonal pattern of preterm deliveries in Mashhad using ARIMA time series models. The Preterm delivery related data were collected during 2003 to 2013 from Women's Health Research Center and regarding the autocorrelation function (ACF) and partial autocorrelation function (PACF), and also the absence of trends in data, it was tried to assign goodness of fit to time series models. After selecting the models, the significance of parameters was investigated with the estimation of criterion error and t-values and then, the goodness of fit such as Kolmogorov-Smirnov test and Ryan Joyner test were used for validation of the models. In addition, using the seasonal index (SI), the seasonal pattern of prevalence of preterm delivery was extracted. The results of this study indicated that ARMIMA model (1,1,1)×(0,0,1) was fitted as the best one for investigation of seasonal pattern of the prevalence of preterm delivery. In addition, among 4743, the age groups of 23-30 years had the highest rate of preterm delivery. The frequency of seasonal occurrence indicates that winter in December had the highest percentage of occurrence of preterm deliveries, and the lowest rate was related to spring. In general, preterm deliveries vary with seasonal changes, and environmental factors are significantly effective on the occurrence of this disease.

Road accidents are one of the major causes of mortality and severe injuries, which impose substantial financial and social costs on communities. This study was conducted to investigate the epidemiology of road traffic traumas to the upper and lower extremities.

In this cross-sectional study, victims, admitted to Shahid Beheshti Hospital of Babol, Iran, were evaluated during 2010-2012. Demographic data, accident location, day, season and time of accident, as well as admission time were investigated.

In total, 1049 victims with the mean age of 32.93±16.56 years were included in this study. Overall, 830 (79.1%) and 219 (20%) victims were male and female, respectively. The majority of accidents occurred on inter-urban roads (n=830, 35%) on week days (n=839, 72.5%). The highest frequency of accidents was reported in summer (n=311, 29.6%) between 13:30 pm and 19:30 pm. The longest interval between the accident and hospital admission was 1-2 hours following the accident.

The results of this study showed that road accidents were more frequent in certain hours and seasons of the year. Therefore, recognition of local effective factors in accidents could be a proper guide for authorities to promote accurate and effective health planning.

Seasonal variations in incidence of diseases can be reason of effect of environmental factors on health. Since the seasonal pattern in preterm birth varies across countries and because of importance of preterm births and unknown causes of it, this study was designed to investigate the frequency of preterm births in different seasons.

This cross-sectional study used data of all 5,860 infants born in the Rafsanjan Nik-Nafs hospital in 2011-2012. Inclusion criteria included live birth more than 2 weeks gestational age and birth weight more than 500 grams. Gestational age was determined according to mother's last menstrual period date. The criterion for preterm birth was gestational age less than 37 weeks gestation. Data was collected through delivery records of hospital medical documentary unit. For data analysis, chi-square and Fisher's exact tests was used.

The prevalence of preterm birth in this study was 6.96% (408 cases). The highest and the lowest frequency of preterm births were in January and February, respectively (P 0.031). Also, preterm births was most frequent in spring (8.4%) and it was least frequent in winter 4.9%) (P=0.002). The difference in frequency of preterm births in varying seasons across natural deliveries, Afghan race and boys was found statistically significant (P<0.05).

The results of our study showed that preterm birth increase in the warm seasons of the year and it is necessary for health care systems, as well as nursing and midwifery services to take appropriate action in these circumstances.

Investigation of seasonal suicide might help in learning about the etiology of suicide committers’ behavior. Literature search indicates that a large number of preliminary studies have been carried out on this subject, in many of which seasonal and climatological aspects of suicide have been investigated. In the present study, the seasonal and time pattern of suicide incidence in Iran was determined based a systematic review. Search was performed in the national databases, namely, SID, Iranmedex, Magiran and Medlib, as well as international databases such as PubMed, Scopus and Google scholar, using such keywords as Iran/Iranian, seasonality and suicide. The technical quality of papers was assessed using checklists. Data of each of the preliminary studies were extracted in terms of general variables and such specific variables as season, month, hour, weekdays and climatic conditions. Of a total number of 49,522 documents obtained from a primary electronic search, eventually 32 papers were included in this study. The highest numbers of suicides committed were 7 and 8 in summer and spring, respectively. Similarly, among the primary studies that had reported only the monthly occurrence of suicide, the highest rate in 7 cases was spring and 7 in summer. In most of the studies (8 cases) the highest number of suicides had taken place between 1:00 and 6:00 PM. These findings indicate that suicide occurrence in Iran has a seasonal pattern, most cases committed being in spring and summer.

Hypertensive disorders in pregnancy lead to serious complications such as bleeding and infection that is associated with increased mortality. This study was performed with the aim of evaluating the association between seasonal patterns and preeclampsia This case-control study was performed on 455 pregnant women (205 with preeclampsia and 250 without preeclampsia) who had referred to the maternity of Amol Imam Ali hospital after 20 weeks of gestation from 2008-2013. Data such as demographic characteristics and history of mothers'' disease were collected from medical records on file available in the hospital. Data analysis was performed with SPSS software (version 20) and Chi-square، Fisher''s exact، Mann–Whitney U tests، simple and multiple logistic regression. P<0. 05 was considered significant. the highest incidence of preeclampsia was in the fall (31. 21%) and then in the winter (28. 78%). Chi-square test results showed that there was significant relationship between preeclampsia and the history of abortion، diabetes، hypertension and twin pregnancy (P<0. 05). Also، Mann–Whitney U results showed that the mean maternal age was 28. 61±6. 00 years، gestational age 35. 75±3. 50، and birth weight 2600. 73±841. 28 in mothers with preeclampsia which were significantly different with healthy women. (p<0/05) Understanding the relationship between different weather patterns and preeclampsia can be useful in identifying triggers of the risk of preeclampsia. Also، the results of this study can help to design the plans to perform preventive and treatment measures in susceptible pregnant women and decrease serious complications which threaten the mother and fetus.

Multiple sclerosis (MS) is a chronic disease of the nervous system, the cause of which remains unknown. Its prevalence rate has been estimated at 2.5 million individuals across the globe, and 31.5 individuals per 100,000 in Kerman province, Iran. Although different studies have reported disparate results, there are many authentic reports claiming that seasonal changes affect MS prevalence in certain months. The present study investigated the rate of MS seizures in terms of different seasons. Patients referring to the Neurology Ward of Shafa medical center, affiliated to Kerman University of Medical Sciences, Iran, were examined in a 5 year period from 2007 to 2011. A specially developed form, containing demographic and background information, and results of examinations, was filled out for each and every patient. A neurology faculty member approved MS seizures or otherwise rejected irrelevant observations. Findings were analyzed through SPSS20 software. In the present study, 802 attacks of MS were detected; 187 cases in men (23.32%) and 615 cases in women (76.68%). The mean age of the participants was 32.69 years. The highest rate of hospitalization occurred in winter and spring. This finding is mostly related to MS attacks in women, but in men the rate of attacks are equal in different seasons. During the past 5 years, 802 acute cases of multiple were registered (187 cases (23.3%) in men and 615 cases (76.68%) in women). Most cases occurred in winter and spring, which may be due to seasonal infections or other factors triggered by certain climatic conditions specific to these periods.