scholarly journals Corrigendum to “Weighted estimates for a class of multilinear fractional type operators” [J. Math. Anal. Appl. 362 (2) (2010) 355–373]

2011 ◽  
Vol 383 (2) ◽  
pp. 634-635 ◽  
Author(s):  
Xi Chen ◽  
Qingying Xue
Keyword(s):  
Weighted Estimates ◽  
Fractional Type

scholarly journals Sharp Weighted Bounds for Multilinear Fractional Type Operators Associated with Bergman Projection

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Juan Zhang ◽  
Senhua Lan ◽  
Qingying Xue
Keyword(s):  
Maximal Function ◽  
Bergman Projection ◽  
Weighted Estimates ◽  
Fractional Maximal Function ◽  
Multiple Weights ◽  
Fractional Type

We first introduce the multiple weights which are suitable for the study of Bergman type operators. Then, we give the sharp weighted estimates for multilinear fractional Bergman operators and fractional maximal function.

Weighted estimates for commutators of Hausdorff operators on the Heisenberg group

2020 ◽  
pp. 39-62
Author(s):  
Nguyen Minh Chuong ◽  
◽  
Dao Van Duong ◽  
Nguyen Duc Duyet ◽  
◽  
...  
Keyword(s):  
Heisenberg Group ◽  
Weighted Estimates ◽  
Hausdorff Operators

Divergence in the epidemiological estimates of traumatic brain injury in the United States: comparison of two national databases

2020 ◽  
pp. 1-10
Author(s):  
Brittany M. Stopa ◽  
Maya Harary ◽  
Ray Jhun ◽  
Arun Job ◽  
Saef Izzy ◽  
...  
Keyword(s):  
Traumatic Brain Injury ◽  
Emergency Department ◽  
Brain Injury ◽  
Data Bank ◽  
The United States ◽  
National Sample ◽  
Population Based ◽  
Weighted Estimates ◽  
True Incidence ◽  
Ed Visits

OBJECTIVETraumatic brain injury (TBI) is a leading cause of morbidity and mortality in the US, but the true incidence of TBI is unknown.METHODSThe National Trauma Data Bank National Sample Program (NTDB NSP) was queried for 2007 and 2013, and population-based weighted estimates of TBI-related emergency department (ED) visits, hospitalizations, and deaths were calculated. These data were compared to the 2017 Centers for Disease Control and Prevention (CDC) report on TBI, which used the Healthcare Cost and Utilization Project’s National (“Nationwide” before 2012) Inpatient Sample and National Emergency Department Sample.RESULTSIn the NTDB NSP the incidence of TBI-related ED visits was 59/100,000 in 2007 and 62/100,000 in 2013. However, in the CDC report there were 534/100,000 in 2007 and 787/100,000 in 2013. The CDC estimate for ED visits was 805% higher in 2007 and 1169% higher in 2013. In the NTDB NSP, the incidence of TBI-related deaths was 5/100,000 in 2007 and 4/100,000 in 2013. In the CDC report, the incidence was 18/100,000 in both years. The CDC estimate for deaths was 260% higher in 2007 and 325% higher in 2013.CONCLUSIONSThe databases disagreed widely in their weighted estimates of TBI incidence: CDC estimates were consistently higher than NTDB NSP estimates, by an average of 448%. Although such a discrepancy may be intuitive, this is the first study to quantify the magnitude of disagreement between these databases. Given that research, funding, and policy decisions are made based on these estimates, there is a need for a more accurate estimate of the true national incidence of TBI.

scholarly journals Sleep Duration and Waking Activities in Relation to the National Sleep Foundation’s Recommendations: An Analysis of US Population Sleep Patterns from 2015 to 2017

2021 ◽  
Vol 18 (11) ◽  
pp. 6154
Author(s):  
Michael Osei Mireku ◽  
Alina Rodriguez
Keyword(s):  
Sleep Duration ◽  
Time Use ◽  
Variance Estimation ◽  
Estimation Method ◽  
Short Sleep Duration ◽  
Weighted Estimates ◽  
American Time Use Survey ◽  
Increased Risk ◽  
The Us ◽  
Time Use Survey

The objective was to investigate the association between time spent on waking activities and nonaligned sleep duration in a representative sample of the US population. We analysed time use data from the American Time Use Survey (ATUS), 2015–2017 (N = 31,621). National Sleep Foundation (NSF) age-specific sleep recommendations were used to define recommended (aligned) sleep duration. The balanced, repeated, replicate variance estimation method was applied to the ATUS data to calculate weighted estimates. Less than half of the US population had a sleep duration that mapped onto the NSF recommendations, and alignment was higher on weekdays (45%) than at weekends (33%). The proportion sleeping longer than the recommended duration was higher than those sleeping shorter on both weekdays and weekends (p < 0.001). Time spent on work, personal care, socialising, travel, TV watching, education, and total screen time was associated with nonalignment to the sleep recommendations. In comparison to the appropriate recommended sleep group, those with a too-short sleep duration spent more time on work, travel, socialising, relaxing, and leisure. By contrast, those who slept too long spent relatively less time on each of these activities. The findings indicate that sleep duration among the US population does not map onto the NSF sleep recommendations, mostly because of a higher proportion of long sleepers compared to short sleepers. More time spent on work, travel, and socialising and relaxing activities is strongly associated with an increased risk of nonalignment to NSF sleep duration recommendations.

A Nationwide Study of Skiing and Snowboarding-Related Facial Trauma

2021 ◽  
pp. 194338752199723 ◽  
Author(s):  
Thomas J. Sorenson ◽  
Vedant Borad ◽  
Warren Schubert
Keyword(s):  
Surveillance System ◽  
Pediatric Patients ◽  
Facial Trauma ◽  
Facial Fractures ◽  
Facial Fracture ◽  
Cold Winter ◽  
Injury Surveillance System ◽  
Weighted Estimates ◽  
Patient Demographics ◽  
The Us

Study Design: Retrospective descriptive observational study. Purpose: Skiing and snowboarding offers valuable opportunities for outdoor physical activity throughout the cold winter months, but these activities can result in substantial personally injury. This study aimed to analyze trends in skiing and snowboarding-related facial trauma epidemiology. Methods: The National Electronic Injury Surveillance System (NEISS) was queried for facial trauma related to skiing and snowboarding treated in United States (US) emergency departments between 2010 and 2019. These data and weighted estimates were used to analyze patient demographics, injury location, and etiology. Results: A total of 361 skiing or snowboarding-related facial injuries were recorded. Lacerations were most common injury (165/361; 45.7%), and facial fractures occurred in 21.6% (78/261) of patients. The most common facial fracture locations are the nose (38/78; 48.7%), orbit (17/78; 21.8%), and mandible (15/78; 19.2%). Pediatric patients accounted for 52% (187/361) of these injuries and had higher rates of lacerations (51.9% vs 39.1%, P < 0.05) and hospital admission (4.8% vs 1.15%, P < 0.05) than adults. Adults had a higher rate of facial fracture (30% vs 13.9%, P < 0.001) than children. Conclusions: Skiing and snowboarding-related facial trauma is relatively uncommon in the US. In general, these injuries are largely decreasing, but facial fractures still occur not infrequently during these activities. Based on our data, we strongly urge helmet manufacturers to increase the availability of recreational snowsport helmets that include nose, orbit, and mandible protections, which could help to prevent many of these injuries.

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