scholarly journals Comparison of sample characteristics in two pregnancy cohorts: community-based versus population-based recruitment methods

2013 ◽  
Vol 13 (1) ◽  
Author(s):  
Brenda MY Leung ◽  
Sheila W McDonald ◽  
Bonnie J Kaplan ◽  
Gerald F Giesbrecht ◽  
Suzanne C Tough
Keyword(s):  
Population Based ◽  
Community Based ◽  
Recruitment Methods ◽  
Sample Characteristics

scholarly journals Seroprevalence and correlates of SARS-CoV-2 neutralizing antibodies from a population-based study in Bonn, Germany

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
N. Ahmad Aziz ◽  
Victor M. Corman ◽  
Antje K. C. Echterhoff ◽  
Marcel A. Müller ◽  
Anja Richter ◽  
...  
Keyword(s):  
Neutralizing Antibodies ◽  
Response Rate ◽  
Neutralization Test ◽  
Population Based ◽  
Immunofluorescence Assay ◽  
Test Results ◽  
Community Based ◽  
Population Based Study ◽  
Temporal Course ◽  
Confirmatory Tests

AbstractTo estimate the seroprevalence and temporal course of SARS-CoV-2 neutralizing antibodies, we embedded a multi-tiered seroprevalence survey within an ongoing community-based cohort study in Bonn, Germany. We first assessed anti-SARS-CoV-2 immunoglobulin G levels with an immunoassay, followed by confirmatory testing of borderline and positive test results with a recombinant spike-based immunofluorescence assay and a plaque reduction neutralization test (PRNT). Those with a borderline or positive immunoassay result were retested after 4 to 5 months. At baseline, 4771 persons participated (88% response rate). Between April 24th and June 30th, 2020, seroprevalence was 0.97% (95% CI: 0.72−1.30) by immunoassay and 0.36% (95% CI: 0.21−0.61) when considering only those with two additional positive confirmatory tests. Importantly, about 20% of PRNT+ individuals lost their neutralizing antibodies within five months. Here, we show that neutralizing antibodies are detectable in only one third of those with a positive immunoassay result, and wane relatively quickly.

Recruitment methods for community-based screening for diabetic retinopathy

2000 ◽  
Vol 7 (3) ◽  
pp. 209-218 ◽  
Author(s):  
S.J. Lee ◽  
C.A. McCarty ◽  
C. Sicari ◽  
P.M. Livingston ◽  
C.A. Harper ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Community Based ◽  
Recruitment Methods

scholarly journals Village-to-village screening for hepatitis B and C using quantitative HBsAg and anti-HCV testing with reflex HCV core antigen tests in the remote communities of a resource-rich setting: a population-based prospective cohort study

BMJ Open ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. e046115
Author(s):  
Te-Sheng Chang ◽  
Kao-Chi Chang ◽  
Wei-Ming Chen ◽  
Nien-Tzu Hsu ◽  
Chih-Yi Lee ◽  
...  
Keyword(s):  
Cohort Study ◽  
Hepatitis B ◽  
Prospective Cohort Study ◽  
Prospective Cohort ◽  
Population Based ◽  
Core Antigen ◽  
Remote Communities ◽  
Community Based ◽  
Patient Allocation ◽  
Hcv Testing

ObjectivesCommunity-based screening for hepatitis B virus (HBV) and hepatitis C virus (HCV) is essential for hepatitis elimination. This study attempted to increase screening accessibility and efficacy by using alternative tools.DesignPopulation-based prospective cohort study.SettingHepatitis elimination program at Yunlin County, Taiwan.ParticipantsAll 4552 individuals participated in 60 screening sessions of a community-based HBV and HCV screening project in five rural townships with approximately 95 000 inhabitants in central-western Taiwan.InterventionsTo increase accessibility, 60 outreach screening sessions were conducted in 41 disseminative sites. Quantitative HBV surface antigen (qHBsAg) and anti-HCV testing with reflex HCV core antigen (HCV Ag) tests were employed as alternative screening tools.Main outcome measuresCalculate village-specific prevalence of HBsAg, anti-HCV and HCV Ag and establish patient allocation strategies according to levels of qHBsAg HCV Ag and alanine aminotransferase (ALT).ResultsOf 4552 participants, 553, 697 and 290 were positive for HBsAg, anti-HCV and HCV Ag, respectively; 75 of them had both HBsAg and anti-HCV positivity. The average (range) number of participants in each screening session was 98 (31–150). The prevalence rates (range) of HBsAg, anti-HCV and HCV Ag were 12.1% (4.3%–19.4%), 15.3% (2.6%–52.3%) and 6.4% (0%–30.2%), respectively. The HCV Ag positivity rate among anti-HCV-positive participants was 42% (0%–100%). Using cut-off values of >200 IU/mL for qHBsAg, >3 fmol/L for HCV Ag and >40 IU/mL for ALT as criteria for patient referral, we noted an 80.2% reduction in referral burden. Three villages had high anti-HCV prevalences of 52.3%, 53.8% and 63.4% with corresponding viraemic prevalences of 23.2%, 30.1% and 22% and thus constituted newly identified HCV-hyperendemic villages.ConclusionOutreach hepatitis screening increases accessibility for residents in rural communities. Screening HBV and HCV through qHBsAg and HCV Ag tests provides information concerning viral activities, which might be conducive to precise patient allocation in remote communities.

scholarly journals Prevalence of eczema among older persons: A population-based cross-sectional study

2021 ◽  
Vol 0 ◽  
pp. 1-5
Author(s):  
Vijayan Neena ◽  
Neelakandhan Asokan ◽  
Rajany Jose ◽  
A. Sarin
Keyword(s):  
Older Persons ◽  
Health Workers ◽  
Age Groups ◽  
Medical Knowledge ◽  
Population Based ◽  
Cross Sectional Survey ◽  
Community Based Interventions ◽  
Community Based ◽  
Cross Sectional ◽  
Lichen Simplex Chronicus

Background: There are very few population-based studies on the prevalence of eczema among older persons Aims: To estimate the prevalence and types of eczema in those aged 65 years or more in the community and to evaluate the effectiveness of community-based interventions for case finding. Methods: In the first stage of this cross-sectional survey, trained health workers of a non-governmental organization surveyed the eligible population and identified persons likely to have eczema. In the second stage, dermatologists examined such persons to ascertain the diagnosis. Statistical analysis was done using Epi Info software version 7. Prevalence of eczema was expressed in percentages. Chi-square test was used for comparing the difference in prevalence of eczema in various age groups and sex. Results: Health workers identified 98 persons as possible cases of eczema after interviewing 385 older persons in the community. Among them 95 persons were examined by dermatologists and 44 were confirmed to have eczema (diagnostic accuracy of health workers = 46.3%).Point prevalence of eczema was 11.4% (44/385). Prevalence was similar in males and females. It was greater (18.2 %) among persons aged 81 years or more. Asteatotic eczema, gravitational eczema and lichen simplex chronicus were the more common types of eczema. Limitations: Possible underestimation of the prevalence rates due to limited medical knowledge of health workers; limited facilities for examination and investigations at the medical camps and home visits. Conclusion: There appears to be a considerable burden of eczema among older persons in the community. A community-based approach involving non-governmental organizations has the potential to identify cases and offer care close to their homes.

scholarly journals Variability in Global Prevalence of Interstitial Lung Disease

2021 ◽  
Vol 8 ◽  
Author(s):  
Bhavika Kaul ◽  
Vincent Cottin ◽  
Harold R. Collard ◽  
Claudia Valenzuela
Keyword(s):  
Interstitial Lung Disease ◽  
North America ◽  
Lung Disease ◽  
Relative Frequency ◽  
English Language ◽  
Population Based ◽  
Epidemiologic Studies ◽  
Disease Classification ◽  
Global Burden ◽  
Community Based

There are limited epidemiologic studies describing the global burden and geographic heterogeneity of interstitial lung disease (ILD) subtypes. We found that among seventeen methodologically heterogenous studies that examined the incidence, prevalence and relative frequencies of ILDs, the incidence of ILD ranged from 1 to 31.5 per 100,000 person-years and prevalence ranged from 6.3 to 71 per 100,000 people. In North America and Europe, idiopathic pulmonary fibrosis and sarcoidosis were the most prevalent ILDs while the relative frequency of hypersensitivity pneumonitis was higher in Asia, particularly in India (10.7–47.3%) and Pakistan (12.6%). The relative frequency of connective tissue disease ILD demonstrated the greatest geographic variability, ranging from 7.5% of cases in Belgium to 33.3% of cases in Canada and 34.8% of cases in Saudi Arabia. These differences may represent true differences based on underlying characteristics of the source populations or methodological differences in disease classification and patient recruitment (registry vs. population-based cohorts). There are three areas where we feel addition work is needed to better understand the global burden of ILD. First, a standard ontology with diagnostic confidence thresholds for comparative epidemiology studies of ILD is needed. Second, more globally representative data should be published in English language journals as current literature has largely focused on Europe and North America with little data from South America, Africa and Asia. Third, the inclusion of community-based cohorts that leverage the strength of large databases can help better estimate population burden of disease. These large, community-based longitudinal cohorts would also allow for tracking of global trends and be a valuable resource for collective study. We believe the ILD research community should organize to define a shared ontology for disease classification and commit to conducting global claims and electronic health record based epidemiologic studies in a standardized fashion. Aggregating and sharing this type of data would provide a unique opportunity for international collaboration as our understanding of ILD continues to grow and evolve. Better understanding the geographic and temporal patterns of disease prevalence and identifying clusters of ILD subtypes will facilitate improved understanding of emerging risk factors and help identify targets for future intervention.

scholarly journals Screening for Pregnancy Status in a Population-Based Sample: Characteristics Associated with Item Nonresponse

2019 ◽  
Vol 23 (3) ◽  
pp. 316-324
Author(s):  
Suzanne C. Hughes ◽  
◽  
Carol J. Hogue ◽  
Melissa A. Clark ◽  
Jessica E. Graber ◽  
...  
Keyword(s):  
Population Based ◽  
Item Nonresponse ◽  
Pregnancy Status ◽  
Sample Characteristics

scholarly journals Comparison of anthropometric indicators to predict mortality in a population-based prospective study of children under 5 years in Niger

2019 ◽  
Vol 23 (3) ◽  
pp. 538-543 ◽  
Author(s):  
Kieran S O’Brien ◽  
Abdou Amza ◽  
Boubacar Kadri ◽  
Beido Nassirou ◽  
Sun Y Cotter ◽  
...  
Keyword(s):  
Cluster Randomized Trial ◽  
Population Based ◽  
Community Based ◽  
Anthropometric Indicators ◽  
Arm Circumference ◽  
Cluster Randomized ◽  
Mid Upper Arm Circumference ◽  
Height For Age ◽  
Weight For Age ◽  
Children Under 5

AbstractObjective:In the present study, we aimed to compare anthropometric indicators as predictors of mortality in a community-based setting.Design:We conducted a population-based longitudinal study nested in a cluster-randomized trial. We assessed weight, height and mid-upper arm circumference (MUAC) on children 12 months after the trial began and used the trial’s annual census and monitoring visits to assess mortality over 2 years.Setting:Niger.Participants:Children aged 6–60 months during the study.Results:Of 1023 children included in the study at baseline, height-for-age Z-score, weight-for-age Z-score, weight-for-height Z-score and MUAC classified 777 (76·0 %), 630 (61·6 %), 131 (12·9 %) and eighty (7·8 %) children as moderately to severely malnourished, respectively. Over the 2-year study period, fifty-eight children (5·7 %) died. MUAC had the greatest AUC (0·68, 95 % CI 0·61, 0·75) and had the strongest association with mortality in this sample (hazard ratio = 2·21, 95 % CI 1·26, 3·89, P = 0·006).Conclusions:MUAC appears to be a better predictor of mortality than other anthropometric indicators in this community-based, high-malnutrition setting in Niger.

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