scholarly journals A two-stage cluster sampling method using gridded population data, a GIS, and Google EarthTM imagery in a population-based mortality survey in Iraq

2012 ◽  
Vol 11 (1) ◽  
pp. 12 ◽  
Author(s):  
LP Galway ◽  
Nathaniel Bell ◽  
Al SAE ◽  
Amy Hagopian ◽  
Gilbert Burnham ◽  
...  
Keyword(s):  
Sampling Method ◽  
Population Data ◽  
Population Based ◽  
Cluster Sampling ◽  
Two Stage ◽  
Mortality Survey

scholarly journals Periodontal condition of adolescents and associated factors

2019 ◽  
Vol 67 ◽  
Author(s):  
Marise Fagundes SILVEIRA ◽  
Rafael Silveira FREIRE ◽  
Maria Fernanda Santos Figueiredo BRITO ◽  
Andrea Maria Eleutério de Barros Lima MARTINS ◽  
Luiz Francisco MARCOPITO
Keyword(s):  
Public Schools ◽  
Oral Health ◽  
Sampling Method ◽  
Population Based ◽  
Dental Service ◽  
Cluster Sampling ◽  
Cross Sectional ◽  
Population Based Study ◽  
Periodontal Condition ◽  
Type Of School

ABSTRACT Objective: This study aimed to describe the periodontal condition of adolescents and identify its potential determinants. Methods: This is a cross-sectional population-based study (n=763) conducted in a city in Northern Minas Gerais. Multistage probability cluster sampling method was used. Trained and calibrated professionals carried out the intraoral examinations and the interviews at the participants’ homes. Logistic regression model was used to identify the factors associated with the periodontal condition. Results: It was found that around 30% of the adolescents presented periodontal changes, being gingival bleeding (14.1%) and dental calculus (14.0%) the most prevalent impairments. Periodontal changes were associated in adolescents who did not attend school (OR=1,9; p=0.031), attended public schools (OR=2,0; p=0.005), never went to the dentist (OR=1,7; p=0,047), used public/philanthropic services (OR=1,7; p=0,002), smoked (OR=1,6; p=0,003), consumed alcohol (OR=1,6; p=0,016) and self-perceived their oral health as too bad/bad (OR=2,4; p=0,032) and regular (OR=1,5; p=0,023). Conclusion: About one-third of adolescents have periodontal changes, which were associated with the type of school and type of dental service they attend, smoking, alcohol consumption and self-perception of oral health.

scholarly journals Accuracy of Mothers’ Reports Regarding Vaccination Status of Their Children in Urban Bangladesh

1970 ◽  
Vol 21 (1) ◽  
pp. 40-43 ◽  
Author(s):  
ABM Selimuzzaman ◽  
MA Ullah ◽  
MJ Haque
Keyword(s):  
Sampling Method ◽  
Metropolitan Areas ◽  
Retention Rate ◽  
Economic Status ◽  
Vaccination Status ◽  
Cluster Sampling ◽  
Two Stage ◽  
Urban Mothers ◽  
Study Child ◽  
Field Workers

With the primary view to test the accuracy of the mothers reports regarding their children's immunization status, this study was carried out in the metropolitan areas of Rajshahi among the mothers of 12-23 months old children, Total 1500 mothers were included in this study as sample units by two stage cluster sampling method. In this study, child immunization card retention rate was 66.22%, Majority of the mothers reported accurately about their children's DPT (76%) and measles (85%) vaccination status. It suggests that urban mothers statements about their children' vaccination status is reliable. And in case of DPT young and educated mothers with higher family economic status and having fewer children were comparatively more reliable than others. Field workers should motivate and encourage the mothers to preserve their children's immunization cards.   doi: 10.3329/taj.v21i1.3217 TAJ 2008; 21(1): 40-43

scholarly journals A Two-Stage Sampling Method for Clinical Surveillance of Individuals in Care for HIV Infection in the United States

2005 ◽  
Vol 120 (3) ◽  
pp. 230-239 ◽  
Author(s):  
Patrick S. Sullivan ◽  
John M. Karon ◽  
Faye E. Malitz ◽  
Stephanie Broyles ◽  
Eve D. Mokotoff ◽  
...  
Keyword(s):  
Hiv Infection ◽  
Medical Records ◽  
Sampling Method ◽  
The United States ◽  
Population Based ◽  
Hiv Care ◽  
Survey Method ◽  
Care Providers ◽  
Two Stage ◽  
Hiv Aids

Objectives. The goals of this study were two-fold: ( 1) to describe methods for drawing a population-based sample of individuals in care for HIV infection and ( 2) to compare data from the sample with data from existing surveillance systems that describe care for HIV. Methods. The authors implemented a two-stage sampling method, using local HIV/AIDS surveillance data as a sampling frame of HIV care providers in three states. At selected providers, medical records of a random sample of patients were abstracted. Results. The medical records of a number of patients, ranging from 253 to 374 individuals per state, were abstracted. The demographics of sampled individuals and of individuals reported to the local HIV/AIDS surveillance program were similar; however, differences existed in the proportion of individuals receiving HIV care consistent with treatment guidelines between the sample and a contemporary facility-based supplemental surveillance project. The median design effect for outcomes collected in the sample was 1.8 (range=0.5–29.6). Conclusions. This survey method is feasible for collecting population-based data on patients in care for HIV. Sample size and some design elements should be changed in future studies to increase precision of estimates and usefulness of data for local planning and evaluation.

Prediction of dark personality traits and self-destruction based on emotion regulation among adolescent females

2020 ◽  
pp. 109-115
Keyword(s):  
Emotion Regulation ◽  
Personality Traits ◽  
Sampling Method ◽  
Risky Behaviors ◽  
Adolescent Females ◽  
Dark Triad ◽  
Cluster Sampling ◽  
Targeted Interventions ◽  
Difficulties In Emotion Regulation ◽  
Academic Year

Background and Aims: Temperament is determined as a relatively constant, basic, and innate position that underlies and modifies the expression of activity, emotionality, and sociability among people. The current study aimed to investigate the prediction of dark personality traits and self-destruction based on emotion regulation among adolescent females. Materials and Methods: This correlational study included 250 adolescent females using a cluster sampling method in the academic year of 2018-19 in Shiraz, Iran. The participants were asked to complete Difficulties in Emotion Regulation Scale, Dark Triad Scale, and Chronic Self-Destructiveness Scale. Results: The results of the regression analysis showed that emotion regulation with beta coefficients was able to predict significant and positive dark personality traits (0.25), narcissism (0.49), Machiavellianism (0.39), psychopathy (0.32), sadism (0.35), and self-destructiveness (0.49) (P<0.05). Conclusion: Directly targeted interventions to regulate emotion may be useful in addressing risky behaviors of adolescents with self-destructive and dark personality traits.

scholarly journals Association of Edentulism with Various Chronic Diseases in Mexican Elders 60+ Years: Results of a Population-Based Survey

Healthcare ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 404
Author(s):  
Alejandro José Casanova-Rosado ◽  
Juan Fernando Casanova-Rosado ◽  
Mirna Minaya-Sánchez ◽  
José Luís Robles-Minaya ◽  
Juan Alejandro Casanova-Sarmiento ◽  
...  
Keyword(s):  
Angina Pectoris ◽  
Mental Disorders ◽  
Chronic Diseases ◽  
Population Based ◽  
Self Report ◽  
World Health ◽  
Complex Nature ◽  
Cluster Sampling ◽  
World Health Survey ◽  
Cross Sectional

Objective: To determine the association of edentulism with different chronic diseases and mental disorders in Mexicans aged 60 years and over. Material and Methods: A cross-sectional study was carried out using data from the World Health Survey for Mexico, in a probabilistic, multi-stage cluster sampling framework. Data for self-report of chronic diseases (diabetes, arthritis, angina pectoris and asthma), mental disorders (depression and schizophrenia) and edentulism were analyzed. Edentulism data were available for 20 of the 32 States of Mexico. Statistical analysis was performed in Stata 14.0 using the svy module for complex sampling (Complex nature under which individuals are sampled). Results: In total 4213 subjects were included, representing a population of 7,576,057 individuals. Mean age was 70.13 ± 7.82 years (range 60 to 98); 56.2% were women. Chronic diseases’ prevalence and mental disorders prevalence were as follows: diabetes 15.0% (N = 1,132,693); arthritis 13.2% (N = 1,001,667); depression 5.5% (N = 414,912); angina pectoris 4.5% (344,315); asthma 3.6% (N = 269,287); and schizophrenia 2.2% (N = 16,988). The prevalence of edentulism was 26.3%, which pertained to 1,993,463 people aged 60 years and over. Angina in women aged 60 to 69 years (p < 0.05) and depression in men aged 70 years and over (p < 0.0001) were associated with higher prevalence of edentulism. Conclusions: There was generally sparse association between edentulism on chronic diseases and mental disorders included in the study, except for women aged 60 to 69 years for angina, and in men aged 70 and over, for depression. Although our findings are misaligned with previous reports, longitudinal studies are required to test causal and temporal relationships between edentulism with chronic diseases and mental disorders.

scholarly journals Mortality beyond emergency threshold in a silent crisis– results from a population-based mortality survey in Ouaka prefecture, Central African Republic, 2020

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Eve Robinson ◽  
Lawrence Lee ◽  
Leslie F. Roberts ◽  
Aurelie Poelhekke ◽  
Xavier Charles ◽  
...  
Keyword(s):  
Central African Republic ◽  
Causes Of Death ◽  
Maternal Mortality Ratio ◽  
Mortality Rates ◽  
Population Based ◽  
Access To Healthcare ◽  
Mortality Data ◽  
Humanitarian Emergency ◽  
The World ◽  
Mortality Survey

Abstract Background The Central African Republic (CAR) suffers a protracted conflict and has the second lowest human development index in the world. Available mortality estimates vary and differ in methodology. We undertook a retrospective mortality study in the Ouaka prefecture to obtain reliable mortality data. Methods We conducted a population-based two-stage cluster survey from 9 March to 9 April, 2020 in Ouaka prefecture. We aimed to include 64 clusters of 12 households for a required sample size of 3636 persons. We assigned clusters to communes proportional to population size and then used systematic random sampling to identify cluster starting points from a dataset of buildings in each commune. In addition to the mortality survey questions, we included an open question on challenges faced by the household. Results We completed 50 clusters with 591 participating households including 4000 household members on the interview day. The median household size was 7 (interquartile range (IQR): 4—9). The median age was 12 (IQR: 5—27). The birth rate was 59.0/1000 population (95% confidence interval (95%-CI): 51.7—67.4). The crude and under-five mortality rates (CMR & U5MR) were 1.33 (95%-CI: 1.09—1.61) and 1.87 (95%-CI: 1.37–2.54) deaths/10,000 persons/day, respectively. The most common specified causes of death were malaria/fever (16.0%; 95%-CI: 11.0–22.7), violence (13.2%; 95%-CI: 6.3–25.5), diarrhoea/vomiting (10.6%; 95%-CI: 6.2–17.5), and respiratory infections (8.4%; 95%-CI: 4.6–14.8). The maternal mortality ratio (MMR) was 2525/100,000 live births (95%-CI: 825—5794). Challenges reported by households included health problems and access to healthcare, high number of deaths, lack of potable water, insufficient means of subsistence, food insecurity and violence. Conclusions The CMR, U5MR and MMR exceed previous estimates, and the CMR exceeds the humanitarian emergency threshold. Violence is a major threat to life, and to physical and mental wellbeing. Other causes of death speak to poor living conditions and poor access to healthcare and preventive measures, corroborated by the challenges reported by households. Many areas of CAR face similar challenges to Ouaka. If these results were generalisable across CAR, the country would suffer one of the highest mortality rates in the world, a reminder that the longstanding “silent crisis” continues.

A comparison of soil sampling procedures used to monitor soil fertility in permanent pastures

Soil Research ◽  
1984 ◽  
Vol 22 (1) ◽  
pp. 81 ◽  
Author(s):  
DK Friesen ◽  
GJ Blair
Keyword(s):  
Sampling Method ◽  
Nutrient Status ◽  
Temporal Variations ◽  
Cluster Sampling ◽  
Soil Test ◽  
Sampling Strategies ◽  
Grazed Pasture ◽  
The Mean ◽  
Sampling Procedures ◽  
Bray 1

Soil testing programs are often brought in disrepute by unexplained variability in the data. The deposition of dung and urine onto grazed pasture brings about marked variation in the chemical status of soils which contributes to this variability. A study was undertaken to compare a range of sampling procedures to estimate Colwell-P, Bray-1 P, bicarbonate K and pH levels in adjacent low and high P status paddocks. The sampling strategies used consisted of 75 by 50 m grids; whole and stratified paddock zig-zag and cluster (monitor plot) samplings. Soil test means for the various parameters did not vary among sampling methods. The number of grid samples required to estimate within 10% of the mean varied from 121 for Bray-1 P down to 1 for soil pH. Sampling efficiencies were higher for cluster sampling than for whole paddock zig-zag path sampling. Stratification generally did not improve sampling efficiency in these paddocks. Soil test means declined as sampling depth increased, but the coefficient of variation remained constant for Colwell-P and pH. The results indicate that cluster sampling (monitor plots) is the most appropriate procedure for estimating the nutrient status of grazed pastures. This sampling method enables a more accurate measure to be taken of the nutrient status of a paddock and should allow more reasonable estimates to be made of the temporal variations in soil test.

scholarly journals Falls among the elderly: risk factors in a population-based study

2014 ◽  
Vol 17 (3) ◽  
pp. 705-718 ◽  
Author(s):  
Iara Guimarães Rodrigues ◽  
Gustavo Pereira Fraga ◽  
Marilisa Berti de Azevedo Barros
Keyword(s):  
The Elderly ◽  
Population Based ◽  
Cross Sectional Study ◽  
Cluster Sampling ◽  
Elderly Adults ◽  
Cross Sectional ◽  
Population Based Study ◽  
Factors Associated ◽  
Gender And Age ◽  
Policies And Programs

Purpose: The aim of the present study was to identify factors associated with the occurrence of falls among elderly adults in a population-based study (ISACamp 2008). Methods: A population-based cross-sectional study was carried out with two-stage cluster sampling. The sample was composed of 1,520 elderly adults living in the urban area of the city of Campinas, São Paulo, Brazil. The occurrence of falls was analyzed based on reports of the main accident occurred in the previous 12 months. Data on socioeconomic/demographic factors and adverse health conditions were tested for possible associations with the outcome. Prevalence ratios (PR) were estimated and adjusted for gender and age using the Poisson multiple regression analysis. Results: Falls were more frequent, after adjustment for gender and age, among female elderly participants (PR = 2.39; 95% confidence interval (95%CI) 1.47 - 3.87), elderly adults (80 years old and older) (PR = 2.50; 95%CI 1.61 - 3.88), widowed (PR = 1.74; 95%CI 1.04 - 2.89) and among elderly adults who had rheumatism/arthritis/arthrosis (PR = 1.58; 95%CI 1.00 - 2.48), osteoporosis (PR = 1.71; 95%CI 1.18 - 2.49), asthma/bronchitis/emphysema (PR = 1,73; 95%CI 1.09 - 2.74), headache (PR = 1.59; 95%CI 1.07 - 2.38), mental common disorder (PR = 1.72; 95%CI 1.12 - 2.64), dizziness (PR = 2.82; 95%CI 1.98 - 4.02), insomnia (PR = 1.75; 95%CI 1.16 - 2.65), use of multiple medications (five or more) (PR = 2.50; 95%CI 1.12 - 5.56) and use of cane/walker (PR = 2.16; 95%CI 1.19 - 3,93). Conclusion: The present study shows segments of the elderly population who are more prone to falls through the identification of factors associated with this outcome. The findings can contribute to the planning of public health policies and programs addressed to the prevention of falls.

scholarly journals Prevalence of thinness, overweight and obesity among Tibetan adolescents aged 12-17 years

2021 ◽  
pp. 1-17
Author(s):  
Yunfei Zhang ◽  
Jiahong Sun ◽  
Min Zhao ◽  
Costan G. Magnussen ◽  
Xi Bo
Keyword(s):  
Sampling Method ◽  
Total Sample ◽  
Overweight And Obesity ◽  
Cluster Sampling ◽  
Cross Sectional Survey ◽  
Clear Trend ◽  
Cross Sectional ◽  
Significant Difference ◽  
Prevalence Of Obesity ◽  
Study Participants

Abstract Objective: To estimate the prevalence of thinness, overweight and obesity among Tibetan adolescents aged 12-17 years. Design: Cross-sectional survey. Setting: Shigatse city of Tibet municipality, with an average altitude of more than 4000 m. Subjects: Study participants included 2,642 adolescents aged 12-17 years selected from 6 schools using a convenient cluster sampling method. Results: The prevalence of thinness/overweight/obesity among Tibetan adolescents was 9.4%/5.4%/1.4% (China definition), 14.7%/4.4%/0.7% (IOTF definition), and 2.8%/5.7%/0.9% (WHO definition). The prevalence of thinness and overweight was significantly different between both sexes based on each of three BMI classification criteria (P <0.001). There was no significant difference in the prevalence of obesity between both sexes according to each of three BMI criteria. There was no clear trend in the prevalence of thinness across ages according to the China or IOTF definition (both P >0.05), whereas an upward trend was observed for thinness in boys according to the IOTF definition (P for trend <0.05). In contrast, the prevalence of thinness tended to decrease with increasing age in girls according to the IOTF definition, and in total sample according to the WHO definition (P for trend <0.05). Conclusions: Among Tibetan adolescents, the prevalence of overweight and obesity is relatively low, while the prevalence of thinness is high, especially in boys. These data suggest urgent attention is needed to control adolescent thinness in Tibet.

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