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Context. The most advanced and fastest growing form of bariatric surgery is laparoscopic gastric bypass. Very little is known about population-based 180-day laparoscopic bypass costs, complication rates, readmission rates, and post-operative care.

Objective. To examine the 6-month costs and outcomes of laparoscopic vs. open bariatric bypass surgery using a national population-based sample.

Design. We use the 1998–2003 Nationwide Inpatient Sample to examine national trends in the rate of laparoscopic bypass. To examine post-operative outcomes, we examine insurance claims for 2,384 bariatric bypass surgeries, at 308 hospitals, among a population of 5.6 million non-elderly people covered by large employers across 49 states in 2001 and 2002. Multivariate logit regression analysis is performed to risk-adjust outcomes.

Main Outcome Measures. 180-day outcomes: 12 complications specific to bariatric surgery and 44 general post-operative conditions, readmission rates, ER rates, and expenditures following bariatric surgery.

Results. Between 1998 and 2003, the national percentage of bariatric bypass surgeries that were laparoscopic grew from 1.5 to 17.1%. There was no significant difference in in-hospital mortality between laparoscopy and open surgery. With the 2001–2002 claims data, we find that of the patients having bypass surgery, men had 48% lower odds of having laparoscopy and that high bariatric volume hospitals were close to four times more likely to use laparoscopy. Laparoscopic bypass, compared with open bypass, had 34% lower odds of a complication during the initial surgical stay, 27% lower odds of a 30-day complication, but no statistically significant difference in 180-day complications. Laparoscopy had 49% higher odds of having the general 44 post-operative conditions, with 45% higher odds of a readmission and 54% higher odds of an ER visit. However, overall, laparoscopy resulted in a 23% lower number of hospital days and 9% lower 180-day expenditures.

Conclusion. The laparoscopic cost-savings during the less invasive initial surgery stay outweigh the increase in post-discharge utilization. Further cost-savings will only emerge from laparoscopy only if its late post-operative complications are reduced. More cost-savings will also emerge as more physicians switch to the use of laparoscopy for bypass surgery.

The purpose of this paper is to examine the prevalence of suicide attempts and explore the suicide methods among community-dwelling Chinese older adults.

Data were drawn from the Population Study of Chinese Elderly in Chicago (PINE) study, a population-based epidemiological study of Chinese older adults aged 60 years and above in the greater Chicago area. Guided by the community-based participatory research (CBPR) approach, the study enrolled 3,159 community-dwelling Chinese older adults from 2011 to 2013.

The lifetime prevalence of suicide attempts is 791 per 100,000 and the past 12-month prevalence of suicide attempts is 285 per 100,000. Medication overdose is the most common suicide method both in the group of lifetime suicide attempts and 12-month suicide attempts. Lower income is positively correlated with lifetime suicide attempts and 12-month suicide attempts. Living with fewer household members is positively correlated with lifetime suicide attempts but not with 12-month suicide attempts.

The findings emphasize the needs for improved understanding of suicidal behavior among minority older adults and to develop culturally and linguistically sensitive prevention and intervention strategies.

Community stakeholders should improve the accessibility and availability of culturally sensitive mental health services and extend timely and effective suicide interventions in the Chinese community.

This study represents the first and largest population-based epidemiological study to investigate the suicide attempts and methods among US Chinese older adults. In addition, the implementation of the CBPR approach allows us to minimize the cultural barriers associated with suicide investigation. The study emphasizes the need for improved understanding on suicidal behavior among minority older adults to inform culturally and linguistically sensitive prevention and intervention strategies.

The objectives of the study are to assess the impact of a community‐based bicycle‐helmet program aimed at children aged 5–12 years (about 140,000). A quasi‐experimental design, including a control group, was used. Sex‐ and age‐group‐based changes in the risk of bicycle‐related head injury leading to hospitalisation were measured, using rate ratios. Compared with the pre‐program period, significant risk reductions were observed during the post‐program period among both boys (RR = 0.56, 95 per cent CI = 0.40, 0.77) and girls (RR = 0.52, 95 per cent CI = 0.33, 0.82), and among both younger (RR = 0.46, 95 per cent CI = 0.31, 0.68) and older (RR = 0.63, 95 per cent CI = 0.44, 0.89) children. A significant reduction was also observable during the program phase among the groups most at risk, i.e. boys (RR = 0.94, 95 per cent CI = 0.66, 1.35) and younger children (RR = 1.07, 95 per cent CI = 0.70, 1.63). The population‐based educational program significantly decreased the risk of head injuries among boys and girls despite observable differences in the voluntary adoption rate of bicycle‐helmet wearing. The impact was more pronounced among younger children.

The purpose of this paper is to present a detailed performance comparison of recent and state-of-the-art population-based optimization algorithms for the air traffic control problem.

Landing sequence and corresponding landing times for the aircrafts were determined by using population-based optimization algorithms such as artificial bee colony, particle swarm, differential evolution, biogeography-based optimization, simulated annealing, firefly and teaching–learning-based optimization. To obtain a fair comparison, all simulations were repeated 30 times for each of the seven algorithms, two different problems and two different population sizes, and many different criteria were used.

Compared to conventional methods that depend on a single solution at the same time, population-based algorithms have simultaneously produced many alternate possible solutions that can be used recursively to achieve better results.

In some cases, it may take slightly longer to obtain the optimum landing sequence and times compared to the methods that give a direct result; however, the processing times can be reduced using powerful computers or GPU computations.

The simulation results showed that using population-based optimization algorithms were useful to obtain optimal landing sequence and corresponding landing times. Thus, the proposed air traffic control method can also be used effectively in real airport applications.

By using population-based algorithms, air traffic control can be performed more effectively. In this way, there will be more efficient planning of passengers’ travel schedules and efficient airport operations.

The study compares the performances of recent and state-of-the-art optimization algorithms in terms of effective air traffic control and provides a useful approach.

To assist in achieving cost effective health care allocations in a collective choice setting, the purpose of this paper is to illustrate the use of a tool not common in the public budgeting literature but is common in the health economics literature.

Through a meta-analysis of the health care spending literature that computed the value of quality-adjusted life years, the authors provide an alternative approach for budgeters and policymakers.

The authors provide an alternative approach for budgeters and policymakers for weighing the benefits of alternative health care spending allocations.

The authors introduce an alternative approach for weighing the benefits of alternative health care spending allocations. As a tool for budgeting professionals, cost per QALY allows for the opportunity to raise cost-effectiveness of public health expenditures as a tool for governments to allocate resources based on outcomes, rather than inputs.

Although homicide-suicide (H-S) offences are rare, they have remarkably tragic consequences. The purposes of this paper are to: examine the background characteristics of H-S offenders (including previous offending history and psychiatric elements); describe the crime-scene behavior and examine the motivational aspects of the offences; and to establish the reliability in the outlined typologies.

The study consists of case series of all H-S offenders in Sweden, January 1, 2007 to December 31, 2009 (n=13), and data was collected from medico-legal autopsy reports, police investigations and three national databases.

Of all Swedish homicides, 5.5 percent consisted of H-S cases, and the rate of H-S was 0.05 per 100,000 inhabitants. Seven of the offenders had had previous contact with a psychiatric service, however, the average time between the last contact and the offence was slightly more than four years. Three of the offenders had previously been convicted of a violent crime and nine of the 13 offenders were involved in serious marital conflicts during the time of the offence. In conclusion, the study supports the notion that cases of H-S are mainly associated with intimate partner homicides, rather than suicide or other homicides. However, the offences were not always directly aimed toward the (former) spouse, but instead carried out through a proxy (such as a common child).

The study adds in-depth knowledge by using a qualitative approach in an otherwise scarce area of research.

Research about the prevalence of dementia among older adults in the incarceration system is currently lacking, and further investigation is warranted. Considering the high level of healthcare needs, unique behavioural issues and difficulty to rehabilitate within the system due to its punitive approach and lack of effective rehabilitation programs, further investigation is warranted to characterize and determine the number of incarcerated older adults with dementia. The purpose of this study is to estimate the prevalence of individuals with dementia in the prison system while also describing the incarceration, demographic and offence-related characteristics of this unique population.

South Carolina (SC) Alzheimer’s Disease and Related Dementias Registry (1992–2016) and South Carolina Department of Corrections (SCDC) data (Fiscal years 1992–2019) were cross-referenced. The prevalence of Alzheimer’s disease and related dementias (ADRD) cases in the corrections system was calculated using South Carolina Alzheimer's Disease (SC AD) SC ADRD Registry and SCDC data. Pearson’s correlation coefficients were calculated to determine strength and direction of relationships between year of incarceration and frequency of ADRD cases both prior to and after incarcerations, respectively. Significant differences by age group, race, gender and dementia type were determined using a two-tailed pooled t-test and Bonferroni approach where appropriate. Count data for types of crimes committed are also presented.

The linkage showed that there were 2,171 individuals within the SC AD Registry who have been in the corrections system, about 1% of those in the Registry. Of these individuals, 1,930 cases were diagnosed with ADRD after incarceration and 241 prior to incarceration. In 2016, 317 individuals with ADRD were incarcerated. For ages 55 and above in South Carolina, the prevalence of ADRD is 6.7% in the general, non-incarcerated population compared to 14.4% in the incarcerated population. Additional results showed that those diagnosed with ADRD between 55 and 65 years of age had a significantly lower mean age at first incarceration (34.6 years of age) than those diagnosed between 66 and 74 years of age (55.9 years of age), indicating that those incarcerated earlier in life had an earlier dementia diagnosis. Additionally, African Americans had a significantly lower mean age at first incarceration (43.4 years of age) than Whites (46.2 years of age) and females had significantly lower mean age at first incarceration (42.9 years of age) than males (45 years of age). When investigating trends, results showed a significant positive linear association between year and frequency of ADRD diagnoses (p-value < 0.05) for those with ADRD diagnosis prior to incarceration and a significant decreasing linear association (p-value < 0.0001) in the number of individuals with an ADRD diagnosis after corrections. Findings also showed that a large percentage of older adults with ADRD in prison did not commit a violence offence.

This study links a population-based Alzheimer’s disease registry and state-wide corrections data to estimate the prevalence of individuals with dementia in the prison system. This linkage presents an opportunity to fill in significant gaps and contribute to the body of literature on dementia among people in prison in the USA.

This paper aims to propose comparing the performance of three algorithms based on different population-based heuristics, particle swarm optimization (PSO), artificial bee colony (ABC) and method of musical composition (DMMC), for the districting problem.

In order to compare the performance of the proposed algorithms, they were tested on eight instances drawn from the Mexican electoral institute database, and their respective performance levels were compared. In addition, a simulated annealing-based (simulated annealing – SA) algorithm was used as reference to evaluate the proposed algorithms. This technique was included in this work because it has been used for Federal districting in Mexico since 1994. The performance of the algorithms was evaluated in terms of the quality of the approximated Pareto front and efficiency. Regarding solution quality, convergence and dispersion of the resulting non-dominated solutions were evaluated.

The results show that the quality and diversification of non-dominated solutions generated by population-based algorithms are better than those produced by Federal Electoral Institute’s (IFE’s) SA-based technique. More accurately, among population-based techniques, discrete adaptation of ABC and MMC outperform PSO.

The performance of three population-based techniques was evaluated for the districting problem. In this paper, the authors used the objective function proposed by the Mexican IFE, a weight aggregation function that seeks for a districting plan that represents the best balance between population equality and compactness. However, the weighting factors can be modified by political agreements; thus, the authors decided to produce a set of efficient solutions, using different weighting factors for the computational experiments. This way, the best algorithm will produce high quality solutions no matter the weighting factors used for a real districting process. The computational experiments proved that the proposed artificial bee colony and method of musical composition-based algorithms produce better quality efficient solutions than its counterparts. These results show that population-based algorithms can outperform traditional local search strategies. Besides, as far as we know, this is the first time that the method of musical composition is used for this kind of problems.

Information on the risk of dementia in aging persons with intellectual and/or developmental disability (IDD) in Manitoba, Canada is lacking. The purpose of this paper is to estimate dementia prevalence in adults with IDD.

Anonymized population-level health and non-health administrative data (1979-2012) contained in the Population Health Research Data Repository of the Manitoba Centre for Health Policy (MCHP) were linked to identify adults with IDD, and estimate the prevalence of dementia based on the presence of ICD codes. Prevalence of dementia was estimated for persons aged 18-55 years and 55+ years, and was reported by sex, type of residence, region of residence, neighbourhood income quintiles, and IDD diagnostic category.

Of the 8,655 adults with IDD identified, 8.1 per cent had an indication of dementia in their medical records; an estimate three times greater than that found for those without IDD (2.6 per cent). More than 17 per cent of Manitobans with IDD aged 55+ years had an indication of dementia, which was nearly twice the rate reported previously. Of those with IDD and dementia, 34.7 per cent lived in long-term care facilities.

Health and social support services are typically available to individuals with dementia aged 65+ years; thus, younger adults with IDD and dementia may not be eligible for those supports. To promote equity in health and access to care, dementia screening and increased supports for aging individuals with IDD are recommended.

Acids have the potential to dissolve or erode teeth. Dental erosion and dental decay are two very different processes. This review aims to explain what is erosion and how it is caused. Potentially erosive dietary acids in drinks and foods tested under laboratory conditions have resulted in eroded teeth, but epidemiological data on the degree of risk have been more difficult to determine. This paper outlines the chemical factors influencing erosive potential and reviews the current literature.