scholarly journals Risk factors for intradomiciliary infestation by the Chagas disease vector Triatoma dimidiatain Jutiapa, Guatemala

2009 ◽  
Vol 25 (suppl 1) ◽  
pp. S83-S92 ◽  
Author(s):  
Dulce Maria Bustamante ◽  
Carlota Monroy ◽  
Sandy Pineda ◽  
Antonieta Rodas ◽  
Xochitl Castro ◽  
...  
Keyword(s):  
Risk Factors ◽  
Socioeconomic Status ◽  
Chagas Disease ◽  
Linear Models ◽  
Control Strategies ◽  
Chi Square ◽  
Disease Vector ◽  
Log Linear ◽  
Chi Square Analysis

Seventeen variables were evaluated as possible risk factors for the intradomiciliary infestation with Triatoma dimidiata in 644 houses in Jutiapa, Guatemala. During 2004 the houses were assessed for vector presence and evaluated for hygiene, cluttering, material comfort, construction conditions and number of inhabitants, among other factors. Chi-square analysis detected significant associations between vector presence and eight variables related to domestic sanitary and construction conditions. Log-linear models showed that regardless of the age of the house, the odds of vector presence were 4.3 and 10 times lower in houses with a good socioeconomic status compared with poor and very poor houses respectively. Log-linear models also pointed to a greater chance of vector presence when walls lacked plastering (3.85 times) or walls had low quality-incomplete plastering (4.56 times), compared with walls that were completely plastered. Control strategies against T. dimidiata should include the introduction of better-quality but inexpensive plastering formulations and better sanitation practices should also be promoted among the population. Such control strategies should not only reduce or eliminate infestation, but also prevent vector reinfestation.

scholarly journals Household risk factors associated to infestation of Triatoma dimidiata, the Chagas disease vector in Central Region of Veracruz, Mexico

2014 ◽  
Vol 56 (2) ◽  
pp. 213 ◽  
Author(s):  
César A Sandoval-Ruiz ◽  
Roger Guevara ◽  
Sergio Ibáñez-Bernal
Keyword(s):  
Risk Factors ◽  
Chagas Disease ◽  
Central Region ◽  
Control Strategies ◽  
The State ◽  
Light Weight ◽  
Factors Associated ◽  
Disease Vector ◽  
Concrete Blocks ◽  
Light Weight Aggregate

 Objective. To evaluate risk factors facilitating the coloniza­tion of dwellings by Triatoma dimidiata in the central region of the state of Veracruz. Materials and methods. We applied socioeconomic questionnaires and entomologic surveys in three localities (Chavarrillo, Soyacuautla and Arroyo Agrio) in central Veracruz involving 115 households. Results. We found that the main risk factors were the predominance of unplastered walls and particularly those made of light weight aggregate concrete blocks and wood. At Chavarrillo, houses usually have unplastered walls, whereas in Soyocuautla walls are commonly manufactured with wood. In Arroyo Agrio, the phenomenon was seasonal, and bugs were commonly found in the dry season, particularly in relatively new houses, less than 20 years old. Conclusions. These results help to improve the surveillance capacity for this vector and the control strategies to reduce the transmission of Chagas disease in the state of Veracruz and other sites where this species is present.

scholarly journals Elimination of Intravenous Di-2-Ethylhexyl Phthalate Exposure Abrogates Most Neonatal Hypertension in Premature Infants with Bronchopulmonary Dysplasia

Toxics ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 75
Author(s):  
Randall Jenkins ◽  
Katia Farnbach ◽  
Sandra Iragorri
Keyword(s):  
Risk Factors ◽  
Bronchopulmonary Dysplasia ◽  
Neonatal Intensive Care ◽  
Low Birthweight ◽  
Chi Square ◽  
Neonatal Hypertension ◽  
Vlbw Infants ◽  
Chi Square Analysis ◽  
Ethylhexyl Phthalate ◽  
Current Report

(1) Background: The incidence of hypertension in very low birthweight (VLBW) infants in a single neonatal intensive care unit (NICU) dropped markedly during a 2-year period when the IV fluid (IVF) in both the antenatal unit and the NICU temporarily changed to a di-2-ethylhexyl phthalate (DEHP)-free formulation. The objective of the current report is to document this observation and demonstrate the changes in incidence of hypertension were not associated with the variation in risk factors for hypertension; (2) Methods: The charts of all VLBW infants born in a single NICU during a 7-year span were reviewed. This time includes 32 months of baseline, 20 months of DEHP-free IVF, 20 months of IVF DEHP re-exposure, and two 4-month washout intervals. The group of interest was limited to VLBW infants with bronchopulmonary dysplasia (BPD). Chi-square analysis was used to compare incidence of hypertension among periods. Vermont Oxford NICU Registry data were examined for variation in maternal and neonatal risk factors for hypertension; Results: Incidence of hypertension in VLBW infants with BPD decreased from 7.7% (baseline) to 1.4% when IVF was DEHP-free, rising back to 10.1% when DEHP-containing IVF returned to use. Risk factors for neonatal hypertension were stable across the 3 study periods in the NICU’s group of VLBW infants; (3) Conclusions: Serendipitous removal of IVF containing DEHP resulted in near elimination of hypertension in one NICU—an effect entirely reversed after the same brand of DEHP-containing IVF returned to clinical use. These results suggest that DEHP exposure from IVF plays a major role in neonatal hypertension.

scholarly journals CORRELATION OF EXCLUSIVE BREASTFEEDING AND CIGARETTE SMOKE EXPOSURE WITH PNEUMONIA IN CHILDREN UNDER TWO YEARS

2020 ◽  
Vol 8 (3) ◽  
pp. 228
Author(s):  
Denisca Vanya Almeida ◽  
Fariani Syahrul
Keyword(s):  
Risk Factors ◽  
Cigarette Smoke ◽  
Exclusive Breastfeeding ◽  
Simple Random Sampling ◽  
Observational Research ◽  
Cigarette Smoke Exposure ◽  
Chi Square ◽  
Prevention Education ◽  
Control Research ◽  
Chi Square Analysis

Background: Pneumonia is one of the leading causes of death for children and is caused by pneumococcus, staphylococcus, and streptococcus bacteria. Exclusive breastfeeding and exposure to cigarette smoke are risk factors for pneumonia in children less than two years old. Purpose: The aim of this research was to analyze the relationship between exclusive breastfeeding or exposure to cigarette smoke and pneumonia in children aged less than two years at Public Health Center (PHC) of Wates, Kediri District. Methods: This research employed analytic observational research using a case–control research design. The number of research samples used was 60, consisting of 30 case respondents and 30 control respondents. The samples were taken in the PHC of Wates, Kediri District’s working area in July 2019. The determination of the samples was carried out through simple random sampling. The data were analyzed using chi-square analysis. Results: The research variables related to pneumonia in children less than two years old at PHC of Wates, Kediri District were exclusive breastfeeding with Odds Ratio (OR) = 3.50 (95% Confidence Interval (CI) = 1.20–10.19), the age of the mothers of the two-year-old infants with OR = 0.19 (95% CI = 0.04–0.78), and the education of the mothers of children less than two years old with OR = 3.14 (95% CI = 1.07–9.27). Conclusion: Exclusive breastfeeding, maternal age, and mothers’ level of education are some of the risk factors for pneumonia. The suggestion from this research is to hold socialization in the form of pneumonia prevention, education on exclusive breastfeeding for mothers who have children under two years of age, and the dangers of smoking for children's health.

The Prevalence of Persistent Intradialytic Hypertension in a Hemodialysis Population with Extended Follow-Up

2012 ◽  
Vol 35 (12) ◽  
pp. 1031-1038 ◽  
Author(s):  
Peter N. Van Buren ◽  
Catherine Kim ◽  
Robert D. Toto ◽  
Jula K. Inrig
Keyword(s):  
Blood Pressure ◽  
Linear Models ◽  
Hemodialysis Patients ◽  
Weight Changes ◽  
Mixed Linear Models ◽  
Ultrafiltration Rate ◽  
Chi Square ◽  
Median Percentage ◽  
Chi Square Analysis

Background Intradialytic hypertension, a phenomenon where blood pressure increases during hemodialysis, is associated with increased mortality in hemodialysis patients. The proportion of patients in which intradialytic hypertension persists over time is unknown. Methods In a retrospective cohort study, we studied all patients from our outpatient hemodialysis units that received ≥1 month of treatments during the period from January to August 2010. We reviewed all pre- and post-hemodialysis blood pressure and weight measurements from 22,955 treatments during this study period. We defined intradialytic hypertension as an increase in systolic blood pressure ≥10 mmHg from pre- to post-hemodialysis. Individual patients were defined as having persistent intradialytic hypertension if the change in blood pressure from pre- to post-hemodialysis, when averaged throughout the study period, was ≥+10 mmHg. We calculated weight changes between and during hemodialysis and defined ultrafiltration rate per treatment as ultrafiltration volume divided by minutes on hemodialysis. We compared patients with and without persistent intradialytic hypertension using chi-square analysis and mixed linear models. Results The prevalence of intradialytic hypertension was 21.3 per 100 treatments. The median percentage of intradialytic hypertension treatments per patient was 17.8% (9–31.3%, interquartile range). The prevalence of persistent intradialytic hypertension was 8 per 100 patients. Patients with persistent intradialytic hypertension had lower ultrafiltration rate compared to other patients (10.4 vs. 12.2 ml/min, p = 0.02). Conclusions Intradialytic hypertension is a persistent phenomenon in a subset of hemodialysis patients. Ultrafiltration rate was the only volume-related variable that differed between patients with and without persistent intradialytic hypertension.

scholarly journals Risk factors for domestic infestation by the Chagas disease vector, Triatoma dimidiata in Chiquimula, Guatemala

2013 ◽  
Vol 103 (6) ◽  
pp. 634-643 ◽  
Author(s):  
E. N. I. Weeks ◽  
C. Cordón-Rosales ◽  
C. Davies ◽  
S. Gezan ◽  
M. Yeo ◽  
...  
Keyword(s):  
Risk Factors ◽  
Chagas Disease ◽  
Current Method ◽  
Cost Effective ◽  
Subsequent Treatment ◽  
Disease Vector ◽  
Surrounding Environment ◽  
Increased Risk ◽  
High Level ◽  
House Infestation

AbstractIn Guatemala prior to control initiatives, the main vectors of Trypanosoma cruzi, the causative agent of Chagas disease, were Rhodnius prolixus and Triatoma dimidiata. This study conducted in 2006 in the department of Chiquimula recorded a high level of T. dimidiata infestation and an absence of R. prolixus in all surveyed communities. In Guatemala, the presence of T. dimidiata as domestic, peridomestic and sylvatic populations results in control difficulties as houses are re-infested from the surrounding environment. Entomological surveys, the current method used to select houses in need of control efforts, are labour intensive and time consuming. A time- and cost-effective way to prioritize houses for evaluation and subsequent treatment is the stratification of houses based on the risk of triatomine infestation. In the present study, 17 anthropogenic risk factors were evaluated for associations with house infestation of T. dimidiata including: wall, floor and roof type. There was an increased likelihood of domestic infestation with T. dimidiata associated with the presence of dirt floors (18/29; OR 8.075, 95% CI 2.13–30.6), uncoated bajareque walls (12/17; OR 4.80, 95% CI 1.35–17.1) and triatomine-like faeces on walls (16/26; OR 3.89, 95% CI 1.19–12.7). These factors could be used to target control of T. dimidiata to communities with an increased risk of being infested.

scholarly journals Cost-Effectiveness of Chagas Disease Vector Control Strategies in Northwestern Argentina

2009 ◽  
Vol 3 (1) ◽  
pp. e363 ◽  
Author(s):  
Gonzalo M. Vazquez-Prokopec ◽  
Cynthia Spillmann ◽  
Mario Zaidenberg ◽  
Uriel Kitron ◽  
Ricardo E. Gürtler
Keyword(s):  
Cost Effectiveness ◽  
Vector Control ◽  
Chagas Disease ◽  
Control Strategies ◽  
Northwestern Argentina ◽  
Disease Vector

scholarly journals Genetic characterization and risk factors for feline hemoplasma infection in semi-domesticated cats in Bangkok, Thailand

2020 ◽  
Vol 13 (5) ◽  
pp. 975-980 ◽  
Author(s):  
Thom Do ◽  
Ketsarin Kamyingkird ◽  
Linh Khanh Bui ◽  
Tawin Inpankaew
Keyword(s):  
Risk Factors ◽  
Phylogenetic Tree ◽  
Genetic Characterization ◽  
Control Strategies ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Chi Square ◽  
Effective Prevention ◽  
Stray Cats ◽  
Vector Borne

Background and Aim: Stray cats are a reservoir for various zoonotic diseases relevant to public health in Thailand. The vector-borne infection, hemoplasmosis, also known as infectious anemia, is one such disease carried by domestic and wild felids. This study focuses on molecular characterization and phylogenetic analysis of hemoplasma in semi-domesticated cats in Bangkok, Thailand. Materials and Methods: In total, 473 blood samples were collected from 53 temple communities in 34 metropolitan districts and assayed using polymerase chain reaction (PCR) to amplify partial 16S rRNA genes for hemoplasma detection. Risk factors for hemoplasma infection (gender, age, free-roaming, and ectoparasite exposure) were analyzed using Chi-square tests, logistic regression, and odds ratios (OR) with 95% confidence intervals (95% CI) using R software (version 3.6.1). A phylogenetic tree was established from genetic characterization of hemoplasmas. Results: In total, 180 samples (38.05%) were positive for hemoplasma. Of half of the positive sequenced samples, 83.33% were infected with Candidatus Mycoplasma haemominutum (CMhm), 13.33% with Mycoplasma haemofelis (Mhf), and 3.33% with Candidatus Mycoplasma turicensis (CMt). Cats over 5 years old were more likely to be infected than younger cats (p<0.005, OR=3.8, 95% CI=1.64-4.78). Cats were diagnosed as positive based on PCR assays in 97% (33/34) of districts surveyed. The phylogenetic tree showed two majority clusters with three clades of feline hemotropic mycoplasma. Conclusion: Overall, the survey shows the prevalence (38.05%) and distribution of feline hemoplasma in semi-domesticated cats. This information will contribute to effective prevention and control strategies to minimize infections by feline vector-borne pathogens in Thailand.

scholarly journals Asymptotic Results for Multinomial Models

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2173
Author(s):  
Isaac Akoto ◽  
João T. Mexia ◽  
Filipe J. Marques
Keyword(s):  
Linear Models ◽  
Confidence Regions ◽  
Asymptotic Results ◽  
Chi Square ◽  
Normal Distributions ◽  
Limit Distributions ◽  
Multinomial Models ◽  
Multidimensional Contingency Table ◽  
Log Linear ◽  
Key Parameter

In this work, we derived new asymptotic results for multinomial models. To obtain these results, we started by studying limit distributions in models with a compact parameter space. This restriction holds since the key parameter whose components are the probabilities of the possible outcomes have non-negative components that add up to 1. Based on these results, we obtained confidence ellipsoids and simultaneous confidence intervals for models with normal limit distributions. We then studied the covariance matrices of the limit normal distributions for the multinomial models. This was a transition between the previous general results and on the inference for multinomial models in which we considered the chi-square tests, confidence regions and non-linear statistics—namely log-linear models with two numerical applications to those models. Namely, our approach overcame the hierarchical restrictions assumed to analyse the multidimensional contingency table.

Risk factors for diabetes mellitus and hypertension among artisans in Ogun state, Nigeria

2019 ◽  
Vol 50 (4) ◽  
pp. 695-710 ◽  
Author(s):  
Cathrine A. Oladoyinbo ◽  
Adenike Mercy Abiodun ◽  
Mariam Oluwatoyin Oyalowo ◽  
Irene Obaji ◽  
Abisola Margaret Oyelere ◽  
...  
Keyword(s):  
Physical Activity ◽  
Risk Factors ◽  
Abdominal Obesity ◽  
Dietary Habits ◽  
Activity Level ◽  
Chi Square ◽  
Content Type ◽  
Factors Associated ◽  
Ogun State ◽  
Chi Square Analysis

Purpose This study was designed to assess the risk factors associated with hypertension (HTN) and diabetes among artisans in Ogun State, Nigeria. Evidences suggest increasing prevalence, incidences and morbidity of diabetes and HTN in Nigeria. However, the purpose of this study is to plan and prioritize effective intervention programs, there is need to provide data on the prevalence and risk factors for HTN and diabetes among local groups. Design/methodology/approach In total 300 apparently healthy artisans who have never been diagnosed of diabetes or HTN were randomly selected from five communities. A structured questionnaire was used in obtaining information on the personal characteristics of the respondents. An adapted dietary habit and lifestyle questionnaire were used to assess the dietary habits and lifestyle of the respondents. The WHO global activity questionnaire was adapted and used to gather information on the physical activity level of the respondents. Random blood glucose, blood pressure and anthropometric measurements were assessed using standard instruments. Chi-square (χ2), correlations and multinomial logistic regression analysis were performed to identify significant determinants of diabetes and HTN. Findings Mean age was 34.8 ± 9.9 and prevalence of diabetes and pre-diabetes were 1 and 4.7 per cent, respectively, while HTN and pre-HTN were 48.0 and 30.3 per cent, respectively. About half (55.7 per cent) of the respondents skip at least a meal daily and 31 per cent snack daily. Most (61.4 per cent) consume alcohol and 65.7 per cent engage in high physical activity. Abdominal obesity was significantly higher among women (p = 0.004). Using the chi-square analysis, age, abdominal obesity and educational status were factors found to be significantly associated with diabetes (p = 0.002; p = 0.007; p = 0.004) while age, gender, abdominal obesity and alcohol consumption had significant association with HTN. Although not statistically significant, respondents were 0.8, 1.0 and 1.1 times more likely to be diabetic with increasing body mass index, waist circumference (WC) and age (odd ratio (OR) = 0.78; confidence intervals (CI): 0.51-1.18; OR = 1.04; CI: 0.89-1.21; OR = 1.06; CI: 0.96-1.18, respectively). Abdominal obesity was significantly associated with HTN (OR = 1.08; CI: 1.03-1.13; p = 0.001). Also, older respondents were 1.1 times more likely of becoming hypertensive (OR = 1.07; CI: 1.02-1.11; p = 0.003). Increased risk of diabetes and HTN was found among respondents with increasing age and WC. Research limitations/implications This study was cross-sectional in design; it cannot be used to establish a cause-effect relationship between diabetes, HTN and the observed variables (anthropometric characteristics, dietary habits and lifestyle risk factors). Because of the few numbers (1 per cent) of respondents identified to be diabetic several important risk factors could not be included in the model. Practical implications An understanding of the risk factors associated with diabetes and HTN among sub-groups in the population will help to plan effective interventions targeted at specific groups. Originality/value The findings of this study show the associated risk factors for diabetes and HTN among artisans in Ogun State.

A Marketer'S Guide to Log-Linear Models for Qualitative Data Analysis

1980 ◽  
Vol 44 (3) ◽  
pp. 40-51 ◽  
Author(s):  
Wayne S. DeSarbo ◽  
David K. Hildebrand
Keyword(s):  
Data Analysis ◽  
Qualitative Data ◽  
Potential Problem ◽  
Linear Models ◽  
Model Fitting ◽  
Qualitative Data Analysis ◽  
Chi Square ◽  
Stepwise Procedures ◽  
Log Linear

This article presents a brief description of the development and use of log-linear models. Current research in areas of screening effects, partitioning chi-square statistics, stepwise procedures, and model fitting and selection is discussed. An analysis of inherent model ambiguities is provided, identifying potential problem areas for marketing applications.

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