Actual and Potential Measurements of Fission-Rate Ratios in the NIST Iron Sphere

2008 ◽  
pp. 344-344-8
Author(s):  
RL Perel ◽  
JJ Wagschal ◽  
Y Yeivin
Keyword(s):  
Fission Rate ◽  
Rate Ratios

Measurements of Structural Material Capture to Uranium-235 Fission Rate Ratios in an Intermediate Spectrum Assembly

1980 ◽  
Vol 76 (1) ◽  
pp. 70-77 ◽  
Author(s):  
P. Azzoni ◽  
V. Benzi ◽  
A. Salomoni ◽  
P. L. Chiodi ◽  
C. Giuliani ◽  
...  
Keyword(s):  
Structural Material ◽  
Fission Rate ◽  
Rate Ratios

scholarly journals Incidence of atrial fibrillation, ischaemic heart disease and heart failure in patients with diabetes

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Amy Groenewegen ◽  
Victor W. Zwartkruis ◽  
Betül Cekic ◽  
Rudolf. A. de Boer ◽  
Michiel Rienstra ◽  
...  
Keyword(s):  
Heart Failure ◽  
Atrial Fibrillation ◽  
Heart Disease ◽  
Ischaemic Heart Disease ◽  
Incidence Rate ◽  
Diabetes Status ◽  
Increased Risk ◽  
Patients With Diabetes ◽  
Rate Ratios ◽  
Age And Sex

Abstract Background Diabetes has strongly been linked to atrial fibrillation, ischaemic heart disease and heart failure. The epidemiology of these cardiovascular diseases is changing, however, due to changes in prevalence of obesity-related conditions and preventive measures. Recent population studies on incidence of atrial fibrillation, ischaemic heart disease and heart failure in patients with diabetes are needed. Methods A dynamic longitudinal cohort study was performed using primary care databases of the Julius General Practitioners’ Network. Diabetes status was determined at baseline (1 January 2014 or upon entering the cohort) and participants were followed-up for atrial fibrillation, ischaemic heart disease and heart failure until 1 February 2019. Age and sex-specific incidence and incidence rate ratios were calculated. Results Mean follow-up was 4.2 years, 12,168 patients were included in the diabetes group, and 130,143 individuals in the background group. Incidence rate ratios, adjusted for age and sex, were 1.17 (95% confidence interval 1.06–1.30) for atrial fibrillation, 1.66 (1.55–1.83) for ischaemic heart disease, and 2.36 (2.10–2.64) for heart failure. Overall, incidence rate ratios were highest in the younger age categories, converging thereafter. Conclusion There is a clear association between diabetes and incidence of the major chronic progressive heart diseases, notably with heart failure with a more than twice increased risk.

scholarly journals Effect of COVID-19-related lockdown on ophthalmic practice in Italy: A report from 39 institutional centers

2021 ◽  
pp. 112067212110024
Author(s):  
Roberto dell’Omo ◽  
Mariaelena Filippelli ◽  
Gianni Virgili ◽  
Francesco Bandello ◽  
Giuseppe Querques ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Retinal Detachment ◽  
Retrospective Analysis ◽  
Surgical Procedures ◽  
Public Transportation ◽  
Rhegmatogenous Retinal Detachment ◽  
Intravitreal Injections ◽  
P Value ◽  
Academic Hospitals ◽  
Rate Ratios

Background/objectives: To compare the number of eye surgical procedures performed in Italy in the 2 months following the beginning of lockdown (study period) because of COVID-19 epidemic with those performed in the two earlier months of the same year (intra-year control) and in the period of 2019 corresponding to the lockdown (inter-year control). Methods: Retrospective analysis of surgical procedures carried out at 39 Academic hospitals. A distinction was made between elective and urgent procedures. Intravitreal injections were also considered. Percentages for all surgical procedures and incidence rate ratios (IRR) for rhegmatogenous retinal detachment (RRD) events were calculated. A p value <0.05 was considered significant. Results: A total of 20,886 versus 55,259 and 56,640 patients underwent surgery during the lockdown versus intra-and inter-year control periods, respectively. During the lockdown, only 70% of patients for whom an operation/intravitreal injection was recommended, finally underwent surgery; the remaining patients did not attend because afraid of getting infected at the hospital (23%), taking public transportation (6.5%), or unavailable swabs (0.5%). Elective surgeries were reduced by 96.2% and 96.4%, urgent surgeries by 49.7% and 50.2%, and intravitreal injections by 48.5% and 48.6% in the lockdown period in comparison to intra-year and inter-year control periods, respectively. IRRs for RRDs during lockdown dropped significantly in comparison with intra- and inter-year control periods (CI: 0.65–0.80 and 0.61–0.75, respectively, p < 0.001 for both). Conclusion: This study provides a quantitative analysis of the reduction of eye surgical procedures performed in Italy because of the COVID-19 epidemic.

scholarly journals Incidence of Benign Meningiomas in the United States: Current and Future Trends

2021 ◽  
Author(s):  
Sonia Bhala ◽  
Douglas R Stewart ◽  
Victoria Kennerley ◽  
Valentina I Petkov ◽  
Philip S Rosenberg ◽  
...  
Keyword(s):  
United States ◽  
Age Groups ◽  
Cancer Registries ◽  
Health Impact ◽  
The United States ◽  
Birth Cohorts ◽  
Benign Meningioma ◽  
Case Count ◽  
Future Burden ◽  
Rate Ratios

Abstract Background Benign meningiomas are the most frequently reported central nervous system tumors in the United States (US), with increasing incidence in past decades. However, the future trajectory of this neoplasm remains unclear. Methods We analyzed benign meningioma incidence of cases identified by any means (eg, radiographically with or without microscopic confirmation) in US Surveillance Epidemiology and End Results (SEER) cancer registries among 35–84-year-olds during 2004–2017 by sex and race/ethnicity using age-period-cohort (APC) models. We employed APC forecasting models to glean insights regarding the etiology, distribution, and anticipated future (2018–2027) public health impact of this neoplasm. Results In all groups, meningioma incidence overall increased through 2010, then stabilized. Temporal declines were statistically significant overall and in most groups. JoinPoint analysis of cohort rate-ratios identified substantial acceleration in White men born after 1963 (from 1.1% to 3.2% per birth year); cohort rate-ratios were stable or increasing in all groups and all birth cohorts. We forecast that meningioma incidence through 2027 will remain stable or decrease among 55–84-year-olds but remain similar to current levels among 35–54-year-olds. Total meningioma burden in 2027 is expected to be approximately 30,470 cases, similar to the expected case count of 27,830 in 2018. Conclusions Between 2004–2017, overall incidence of benign meningioma increased and then stabilized or declined. For 2018–2027, our forecast is incidence will remain generally stable in younger age groups but decrease in older age groups. Nonetheless, the total future burden will remain similar to current levels because the population is aging.

Improving Safety of Bilateral Knee Arthroplasty: Impact of Selection Criteria on Perioperative Outcome

2021 ◽  
pp. 155633162110148
Author(s):  
Philipp Gerner ◽  
Stavros G. Memtsoudis ◽  
Crispiana Cozowicz ◽  
Ottokar Stundner ◽  
Mark Figgie ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Selection Criteria ◽  
Perioperative Complications ◽  
Perioperative Outcomes ◽  
Cardiac Complications ◽  
Complication Rates ◽  
Major Complications ◽  
Increased Risk ◽  
Comorbidity Burden ◽  
Rate Ratios

Background: Bilateral total knee arthroplasty (BTKA) procedures are associated with an increased risk of complications when compared with unilateral approaches. In 2006, in an attempt to reduce this risk, our institution implemented selection criteria that specified younger and healthier patients as candidates for BTKA. Questions/Purpose: We sought to investigate the effect of these selection criteria on perioperative outcomes. Methods: In a retrospective cohort study, we used institutional data to identify patients who underwent BTKA between 1998 and 2014. Patients were divided into 2 groups: those who underwent surgery before the 2006 introduction of our selection criteria (1998–2006) and those who underwent surgery after (2007–2014). Groups were compared in terms of demographics, comorbidity burden, and incidence of perioperative complications. Regression analysis was performed, calculating incidence rate ratios to evaluate changes in complication rates. Results: Before the selection criteria were implemented in 2006, patients who underwent BTKA were older and had a higher comorbidity burden. The rate of major complications per 1000 hospital days decreased from 31.5 in 1998 to 7.9 in 2014. A reduction in cardiac complications was the most significant contributor to this decrease in major complications. Conclusion: After stringent criteria for BTKA candidates were implemented at our institution, selection of younger patients with lower comorbidity burden was accompanied by a reduction in the incidence of operative complications. This suggests that introducing such criteria can be associated with a reduction in adverse perioperative outcomes.

scholarly journals Food Environments and Hepatocellular Carcinoma Incidence

2021 ◽  
Vol 18 (11) ◽  
pp. 5740
Author(s):  
Mimi Ton ◽  
Michael J. Widener ◽  
Peter James ◽  
Trang VoPham
Keyword(s):  
Hepatocellular Carcinoma ◽  
Food Environment ◽  
Variance Estimation ◽  
Cancer Registries ◽  
County Level ◽  
Individual Level ◽  
Retail Food Environment ◽  
Food Retailers ◽  
Environment Index ◽  
Rate Ratios

Research into the potential impact of the food environment on liver cancer incidence has been limited, though there is evidence showing that specific foods and nutrients may be potential risk or preventive factors. Data on hepatocellular carcinoma (HCC) cases were obtained from the Surveillance, Epidemiology, and End Results (SEER) cancer registries. The county-level food environment was assessed using the Modified Retail Food Environment Index (mRFEI), a continuous score that measures the number of healthy and less healthy food retailers within counties. Poisson regression with robust variance estimation was used to calculate incidence rate ratios (IRRs) and 95% confidence intervals (CIs) for the association between mRFEI scores and HCC risk, adjusting for individual- and county-level factors. The county-level food environment was not associated with HCC risk after adjustment for individual-level age at diagnosis, sex, race/ethnicity, year, and SEER registry and county-level measures for health conditions, lifestyle factors, and socioeconomic status (adjusted IRR: 0.99, 95% CI: 0.96, 1.01). The county-level food environment, measured using mRFEI scores, was not associated with HCC risk.

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