Effects on Accidents of Automatic Speed Enforcement in Norway

1997 ◽  
Vol 1595 (1) ◽  
pp. 14-19 ◽  
Author(s):  
Rune Elvik
Keyword(s):  
Percent Level ◽  
Regression To The Mean ◽  
Property Damage ◽  
Accident Rate ◽  
Before And After ◽  
The Mean ◽  
Photo Radar ◽  
Speed Enforcement ◽  
Before And After Study

Automatic speed enforcement by means of photo radar was introduced in Norway in 1988. The results of a before-and-after study of the effects of automatic speed enforcement on accidents are reported in this paper. The study controlled for general trends in the number of accidents and regression to the mean. A statistically significant reduction of 20 percent in the number of injury accidents was found. The number of property-damage-only accidents was reduced by 12 percent. This change was not statistically significant at the 5 percent level. The effect of automatic speed enforcement on the number of injury accidents varied according to the level of conformance with official warrants for its use. The warrants refer to accident rate (accidents per vehicle kilometer) and accident density (accidents per kilometer of road). A decline of 26 percent in injury accidents was found on road sections conforming with both warrants. On road sections not conforming with any of the warrants, injury accidents declined by 5 percent. The results of this study confirm the results of previous studies of the effects of automatic speed enforcement on accidents.

scholarly journals Regression to the mean contributes to the apparent improvement in glycemia 3.8 years after screening – the ELSA-Brasil Study

2020 ◽  
Author(s):  
Maria Inês Schmidt ◽  
Paula Bracco ◽  
Scheine Canhada ◽  
Joanna MN Guimarães ◽  
Sandhi Maria Barreto ◽  
...  
Keyword(s):  
Weight Loss ◽  
Real World ◽  
Complete Regression ◽  
Regression To The Mean ◽  
Free Living ◽  
Before And After ◽  
Baseline Values ◽  
The Mean ◽  
Design And Methods

<b>Objective </b> <p>Glycemic regression is common in real world settings, but the contribution of regression to the mean (RTM) has been little investigated. We aimed to estimate glycemic regression before and after adjusting for RTM in a free-living cohort of adults with newly ascertained diabetes and intermediate hyperglycemia (IH). </p> <p><b>Research Design and Methods</b></p> <p>ELSA-Brasil is a cohort study of 15,105 adults screened between 2008-2010 with standardized OGTT and HbA1c, repeated after 3.84 (0.42) years. After excluding those receiving medical treatment for diabetes, we calculated partial or complete regression before and after adjusting baseline values for RTM. </p> <p><b>Results</b></p> <p>Regarding newly ascertained diabetes, partial or complete regression was seen in 49.4% (95%CI 45.2 – 53.7); after adjustment for RTM, in 20.2% (95%CI 12.1 – 28.3). Regarding IH, regression to normal levels was seen in 39.5% (95%CI 37.9 – 41.3) or in 23.7% (95%CI 22.6% – 24.3%) depending on the WHO or the ADA definition, respectively; after adjustment, corresponding frequencies were 26.1% (95%CI 22.4 – 28.1) and 19.4% (95%CI 18.4 – 20.5). Adjustment for RTM reduced the number of cases detected at screening: 526 to 94 cases of diabetes; 3118 to 1986 cases of WHO-defined IH; and 6182 to 5711 cases of AD-defined IH. Weight loss ≥2.6% was associated with greater regression from diabetes (RR=1.52 95%CI 1.26-1.84) and IH (RR=1.30 95%CI 1.17-1.45). </p> <p><b>Conclusions</b></p> <p>In this quasi-real-world setting, regression from diabetes at ~4 years was common, less so for IH. Regression was frequently explained by RTM, but, in part, also related to improved weight loss and homeostasis over the follow-up. </p>

scholarly journals Regression to the mean contributes to the apparent improvement in glycemia 3.8 years after screening – the ELSA-Brasil Study

2020 ◽  
Author(s):  
Maria Inês Schmidt ◽  
Paula Bracco ◽  
Scheine Canhada ◽  
Joanna MN Guimarães ◽  
Sandhi Maria Barreto ◽  
...  
Keyword(s):  
Weight Loss ◽  
Real World ◽  
Complete Regression ◽  
Regression To The Mean ◽  
Free Living ◽  
Before And After ◽  
Baseline Values ◽  
The Mean ◽  
Design And Methods

<b>Objective </b> <p>Glycemic regression is common in real world settings, but the contribution of regression to the mean (RTM) has been little investigated. We aimed to estimate glycemic regression before and after adjusting for RTM in a free-living cohort of adults with newly ascertained diabetes and intermediate hyperglycemia (IH). </p> <p><b>Research Design and Methods</b></p> <p>ELSA-Brasil is a cohort study of 15,105 adults screened between 2008-2010 with standardized OGTT and HbA1c, repeated after 3.84 (0.42) years. After excluding those receiving medical treatment for diabetes, we calculated partial or complete regression before and after adjusting baseline values for RTM. </p> <p><b>Results</b></p> <p>Regarding newly ascertained diabetes, partial or complete regression was seen in 49.4% (95%CI 45.2 – 53.7); after adjustment for RTM, in 20.2% (95%CI 12.1 – 28.3). Regarding IH, regression to normal levels was seen in 39.5% (95%CI 37.9 – 41.3) or in 23.7% (95%CI 22.6% – 24.3%) depending on the WHO or the ADA definition, respectively; after adjustment, corresponding frequencies were 26.1% (95%CI 22.4 – 28.1) and 19.4% (95%CI 18.4 – 20.5). Adjustment for RTM reduced the number of cases detected at screening: 526 to 94 cases of diabetes; 3118 to 1986 cases of WHO-defined IH; and 6182 to 5711 cases of AD-defined IH. Weight loss ≥2.6% was associated with greater regression from diabetes (RR=1.52 95%CI 1.26-1.84) and IH (RR=1.30 95%CI 1.17-1.45). </p> <p><b>Conclusions</b></p> <p>In this quasi-real-world setting, regression from diabetes at ~4 years was common, less so for IH. Regression was frequently explained by RTM, but, in part, also related to improved weight loss and homeostasis over the follow-up. </p>

The ABC of handover: a new tool for handover in the emergency department and its impact on practice

2010 ◽  
Vol 27 (Suppl 1) ◽  
pp. A12.1-A12
Author(s):  
Maisse Farhan
Keyword(s):  
Best Practice ◽  
Current Practice ◽  
Ease Of Use ◽  
Structured Interviews ◽  
Global Improvement ◽  
Operational Strategies ◽  
Before And After ◽  
The Mean ◽  
Abc Method ◽  
Before And After Study

ObjectivesA two-part study identifying best practice for shift handover and introducing a new handover tool; the ABC of Handover. We evaluate its impact and explore user opinions. The ABC tool aims to standardise handover providing effective transition of responsibility in the E.D; enhancing patient safety.MethodsPart 1 consensus based study; structured interviews identified current practice of handover. Best practice was identified and the ABC mnemonic was developed to classify information. Part 2: prospective observational before-and-after study exploring the effect of The ABC of Handover on clinical and organisational practice; measured by observing handovers and verifying the information transmitted by comparing to actual events occurring during the shift (providing a score). Observations were repeated after implementation of The ABC of Handover. Finally, questionnaire were used to appraise the tool.ResultsInterviews revealed lack of standardised practice and identified best practice including clinical and operational strategies to organise the next shift. The ABC method was developed which grouped “best practice” under those headings.41 handovers were observed before implementation and 42 after. Each handover was given a score according to the number of items it contained that were necessary to that particular shift. The mean score given to handovers pre-implementation was 34% with a modal value of 50%. Using The ABC of Handover the mean score was 86% with a modal value of 100%. All participants reported ease of use and improvement with the ABC tool.ConclusionsThis study demonstrates disparity in the understanding of shift handover and identifies best practice in the ABC of Handover which standardised and improved handover. It was successfully implemented and led to a change of practice and a global improvement, providing a framework for safe transition of shift responsibility. This can be used for training in handover for medical and nursing staff in the ED.

Development of Crash Reduction Factors: Methods, Problems, and Research Needs

2003 ◽  
Vol 1840 (1) ◽  
pp. 50-56 ◽  
Author(s):  
Joan Shen ◽  
Albert Gan
Keyword(s):  
Empirical Bayes ◽  
Group Method ◽  
Research Needs ◽  
Regression To The Mean ◽  
Before And After ◽  
Safety Studies ◽  
Development Methods ◽  
Crash Reduction ◽  
Before And After Study ◽  
Reduction Factors

Crash reduction factors (CRFs) are used in highway safety studies to predict safety benefits due to reduced numbers of crashes. NCHRP Report 162 identified the need for the development of a national comprehensive set of CRFs for each state to evaluate safety improvements. However, this need has not been met. As a result, many states have developed their own CRFs or have adopted CRFs from other states. A synthesis of the CRF development methods, the associated problems, and the research needs are provided. The emphasis is placed on the before-and-after study method because it has been, and still is, the method of choice for CRF development. Three before-and-after study methods were introduced and reviewed: ( a) the simple before-and-after method, ( b) the before-and-after study with comparison group method, and ( c) the before-and-after study with the empirical Bayes method. The problems associated with the simple before-and-after studies, including regression to the mean, crash migration, maturation, and external causal factor, are discussed. Several research needs related to crash migration and general CRF development are also identified. The information presented in the synthesis will be useful to states that plan to develop or update their CRFs.

scholarly journals Impact of peer review on discussion of study limitations and strength of claims in randomized trial reports: a before and after study

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Kerem Keserlioglu ◽  
Halil Kilicoglu ◽  
Gerben ter Riet
Keyword(s):  
Logistic Regression ◽  
Peer Review ◽  
Regression Models ◽  
Randomized Trials ◽  
Median Number ◽  
Logistic Regression Models ◽  
Before And After ◽  
The Mean ◽  
Before And After Study ◽  
Manuscript Publication

Abstract Background In their research reports, scientists are expected to discuss limitations that their studies have. Previous research showed that often, such discussion is absent. Also, many journals emphasize the importance of avoiding overstatement of claims. We wanted to see to what extent editorial handling and peer review affects self-acknowledgment of limitations and hedging of claims. Methods Using software that automatically detects limitation-acknowledging sentences and calculates the level of hedging in sentences, we compared the submitted manuscripts and their ultimate publications of all randomized trials published in 2015 in 27 BioMed Central (BMC) journals and BMJ Open. We used mixed linear and logistic regression models, accounting for clustering of manuscript-publication pairs within journals, to quantify before-after changes in the mean numbers of limitation-acknowledging sentences, in the probability that a manuscript with zero self-acknowledged limitations ended up as a publication with at least one and in hedging scores. Results Four hundred forty-six manuscript-publication pairs were analyzed. The median number of manuscripts per journal was 10.5 (interquartile range 6–18). The average number of distinct limitation sentences increased by 1.39 (95% CI 1.09–1.76), from 2.48 in manuscripts to 3.87 in publications. Two hundred two manuscripts (45.3%) did not mention any limitations. Sixty-three (31%, 95% CI 25–38) of these mentioned at least one after peer review. Changes in mean hedging scores were negligible. Conclusions Our findings support the idea that editorial handling and peer review lead to more self-acknowledgment of study limitations, but not to changes in linguistic nuance.

scholarly journals Comparison of Crash Modification Factors for Engineering Treatments Estimated by Before–After Empirical Bayes and Propensity Score Matching Methods

2020 ◽  
pp. 036119812095377
Author(s):  
Bo Lan ◽  
Raghavan Srinivasan
Keyword(s):  
Propensity Score ◽  
Regression Models ◽  
Empirical Bayes ◽  
Regression To The Mean ◽  
Cross Sectional ◽  
Matching Methods ◽  
Before And After ◽  
Crash Modification Factors ◽  
The Mean ◽  
Cross Sectional Studies

Cross-sectional and the empirical Bayes (EB) before–after are two of the most common methods for estimating crash modification factors (CMFs). The EB before–after method has now been accepted as one way of addressing the potential bias caused by the regression to the mean problem. However, sometimes before–after methods may not feasible because of the lack of data from before and after periods. In those cases, researchers rely on cross-sectional studies to develop CMFs. However, cross-sectional studies may provide biased CMFs through confounding. The propensity score (PS) matching method, along with cross-sectional regression models, is one of the methods that can be used to address confounding. Though PS methods are widely used in epidemiology and other studies, there are only a few studies that have used PS matching methods to estimate CMFs. The intent of this study is to evaluate and compare the performance of cross-sectional regression models using PS matching methods with the results from the EB and traditional cross-sectional methods. The comparisons were conducted using two carefully selected simulated datasets. The results indicate that optimal propensity score distance (PSD) matching with maximum variable ratio of 5 performed quite well compared with the EB before–after and the traditional cross-sectional methods.

scholarly journals Evaluation of maxillary first molar rotation during direct miniscrew-supported maxillary canine retraction: a before-and-after study

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Reem M. AlShazly ◽  
Ahmad F. Almohammad ◽  
Hend Salah ElSayed ◽  
Amr Ragab EL-Beialy
Keyword(s):  
Clinical Trial ◽  
Mean Difference ◽  
Trial Registration ◽  
Maxillary Canine ◽  
Canine Retraction ◽  
Link Type ◽  
Before And After ◽  
The Mean ◽  
Canine Distalization ◽  
Before And After Study

Abstract Background Extraction of the first premolar followed by canine retraction into the extraction space is a common treatment in orthodontics. Molar rotation occurs when they are used as anchorage units for the canine distalization. The aim of this single-arm clinical trial was to evaluate the maxillary first molar rotation during maxillary canine retraction with elastic power chains and direct miniscrew anchorage. Results The mean difference between pre-retraction and post-retraction molar rotation was 1.89° ± 0.6 which was statistically insignificant. Conclusion The use of miniscrews for direct anchorage can eliminate unwanted rotation of the maxillary first molars during canine retraction. Trial registration ClinicalTrials.gov, NCT04887974. Registered on May 6, 2021- Retrospectively registered https://clinicaltrials.gov/ct2/show/NCT04887974?id=NCT04887974&draw=2&rank=1.

Perbedaan Pengetahuan Siswa Tentang Penyakit Hepatitis A Sebelum Dan Sesudah Penyuluhan Di MTsN 02 Bondowoso Tahun 2015

2017 ◽  
Vol 4 (2) ◽  
pp. 14
Author(s):  
Putri Megasari
Keyword(s):  
Hepatitis A ◽  
Hepatitis Virus ◽  
Sampling Technique ◽  
Mean Value ◽  
Test Design ◽  
The World ◽  
Before And After ◽  
Post Test ◽  
The Mean ◽  
Paired T Test

Hepatitis has become a health problem in the world. The hepatitis virus infected many people. According to the teacher of MTsN 02 Bondowoso more than 20 students have hepatitis A viral infection. The purpose of this research was to know the differences of students' knowledge about hepatitis A before and after counseling in MTsN 02 Bondowoso 2015. This study used pre-experimental (pre-post test design). This study used stratified random sampling technique, 127 students from 270 sample involved this research,and 143 students was excluded. We used questionnaires to collect data. The results showed that the mean value of the students 'knowledge about hepatitis A before counseling in MTsN 02 Bondowoso 2015 was 83.96 with the lowest value of 37.5 and the highest value was 100. The mean value of the students' knowledge about hepatitis A after counseling in MTsN 02 Bondowoso 2015 was 93.21 with the lowest value waf 62.5 and the highest value was 100. Paired t test showed that t (-9.07) > t table (1.98), the null hypothesis (H0) was rejected. There was a difference between students' knowledge about hepatitis A before and after counseling in MTsN 02 Bondowoso 2015. This study showed that routine counseling by healthcare provider was important to prevent hepatitis A infection.; Keywords: counseling, knowledge of students, hepatitis

Only problem gamblers spend less money when loot boxes are removed from a game: A before and after study of Heroes of the Storm

2019 ◽  
Author(s):  
David Zendle
Keyword(s):  
Video Games ◽  
Problem Gambling ◽  
Video Game ◽  
Real World ◽  
Complex Pattern ◽  
Problem Gamblers ◽  
Before And After ◽  
Gambling Severity ◽  
Reliable Correlation ◽  
Before And After Study

Loot boxes are items in video games that may be paid for with real-world money, but which contain randomised contents. There is a reliable correlation between loot box spending and problem gambling severity: The more money gamers spend on loot boxes, the more severe their problem gambling tends to be. However, it is unclear whether this link represents a case in which loot box spending causes problem gambling; a case in which the gambling-like nature of loot boxes cause problem gamblers to spend more money; or whether it simply represents a case in which there is a general dysregulation in in-game spending amongst problem gamblers, nonspecific to loot boxes.The multiplayer video game Heroes of the Storm recently removed loot boxes. In order to better understand links between loot boxes and problem gambling, we conducted an analysis of players of Heroes of the Storm (n=112) both before and after the removal of loot boxes.There were a complex pattern of results. In general, when loot boxes were removed from Heroes of the Storm, problem gamblers appeared to spend significantly less money in-game in contrast to other groups. These results suggest that the presence of loot boxes in a game may lead to problem gamblers spending more money in-game. It therefore seems possible that links between loot box spending and problem gambling are not due to a general dysregulation in in-game spending amongst problem gamblers, but rather are to do with specific features of loot boxes themselves.

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