Greater Montreal Research Articles

Improving walkability for seniors through accessibility to food stores: a study of three areas of Greater Montreal

The aging of suburbs requires that pedestrian accessibility be favored in this type of environment, because walking is a key element in the quality of life of seniors. This article analyzes the potential for accessibility by foot in three inner suburbs of the Greater Montreal Area. Accessibility was calculated using walking distances throughout the street network. This analysis was complemented by an observation of physical-spatial characteristics likely to affect walking among seniors. Pedestrian accessibility is influenced not only by long travel distances but also by various obstacles that result from land-use decisions in favor of motorized travel on a regional scale. This article reveals the necessity for urban planners to find a balance between local accessibility by foot and public transit, and regional accessibility by motorized transport.

Sunlight exposure during leisure activities and risk of prostate cancer in Montréal, Canada, 2005-2009.

BackgroundProstate cancer (PCa) is the leading cause of cancer in men in many developed countries, but no modifiable risk factors have been identified. A handful of analytical studies have suggested a possible etiological role for sunlight exposure. We report here on the association between leisure-time sunlight exposure during adulthood and PCa risk in the context of a population-based case–control study.MethodsIn all, 1,904 PCa cases were ascertained across Montreal French hospitals between 2005 and 2009. Concurrently, 1,962 population controls, frequency matched to cases by age (±5 years), were selected from the electoral list for French-speakers in Greater Montreal. Interviews elicited the frequency of engagement in any leisure activity during adulthood. This was used to derive cumulative sunlight exposure indices: a cumulative number of leisure activities events entailing sunlight exposure and a cumulative duration of sunlight exposure during leisure activities. Unconditional logistic regression was conducted to yield odds ratios (OR) and 95% confidence intervals (CI) for estimating the association between sunlight exposure indices and PCa risk, adjusting for age, ancestry, family history of PCa, PCa screening, education, solar protection, body mass index and physical activity.ResultsCompared with men in the upper quartile category for the number of sunlight exposure events, men never exposed during leisure time had an OR of 1.32 (95% CI: 0.82-2.14). ORs were 1.11, 0.91 and 1.00 for the first to the third quartiles of exposure, respectively. Similar results were observed for cumulative duration of exposure to sunlight, and by PCa aggressiveness.ConclusionThese findings provide little evidence of an association between sunlight exposure during leisure-time and PCa risk. Men with no sunlight exposure appeared at somewhat higher risks but none of the estimates achieved statistical significance.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2458-14-756) contains supplementary material, which is available to authorized users.

Optimization of the restructuring cost of an urban drainage network

Urban drainage networks are subjected to increased runoff caused by urbanization and climate change. Wear and tear, coupled with a lack of network maintenance, reduces the hydraulic capacity of these networks and results in surcharged flows, discharges and overflows calling for the need to institute effective restructuring strategies. The purpose of this study was to develop an optimization model for the optimal selection and placement of structural best management practices (BMPs). In this research, four types of structural BMPs were being considered (i.e., retention pond, green roofs, infiltration trenches and vegetated depressions). The objective function was to minimize the total cost of BMPs, within the constraints of (1) draining infrequent heavy rainfall without surcharging the conduits and (2) driving frequent small rainfall into the water-treatment plant without overflows. The model was tested on a case study in the Greater Montreal Area and the results obtained from the model effectively demonstrated its capacity to improve the hydraulic and environmental performances by adopting optimal BMPs placement strategies.

Do generic utility measures capture what is important to the quality of life of people with multiple sclerosis?

PurposeThe three most widely used utility measures are the Health Utilities Index Mark 2 and 3 (HUI2 and HUI3), the EuroQol-5D (EQ-5D) and the Short-Form-6D (SF-6D). In line with guidelines for economic evaluation from agencies such as the National Institute for Health and Clinical Excellence (NICE) and the Canadian Agency for Drugs and Technologies in Health (CADTH), these measures are currently being used to evaluate the cost-effectiveness of different interventions in MS. However, the challenge of using such measures in people with a specific health condition, such as MS, is that they may not capture all of the domains that are impacted upon by the condition. If important domains are missing from the generic measures, the value derived will be higher than the real impact creating invalid comparisons across interventions and populations. Therefore, the objective of this study is to estimate the extent to which generic utility measures capture important domains that are affected by MS.MethodsThe available study population consisted of men and women who had been registered after 1994 in three participating MS clinics in Greater Montreal, Quebec, Canada. Subjects were first interviewed on an individualized measure of quality of life (QOL) called the Patient Generated Index (PGI). The domains identified with the PGI were then classified and grouped together using the World Health Organization’s International Classification of Functioning, Disability and Health (ICF), and mapped onto the HUI2, HUI3, EQ-5D and SF-6D.ResultsA total of 185 persons with MS were interviewed on the PGI. The sample was relatively young (mean age 43) and predominantly female. Both men and women had mild disability with a median Expanded Disability Status Scale (EDSS) score of 2. The top 10 domains that patients identified to be the most affected by their MS were, work (62%), fatigue (48%), sports (39%), social life (28%), relationships (23%), walking/mobility (22%), cognition (21%), balance (14%), housework (12%) and mood (11%). The SF-6D included the most number of domains (6 domains) important to people with MS, followed by the EQ-5D (4 domains) and the HUI2 (4 domains) and then the HUI3 (3 domains). The mean and standard deviation (SD) for the PGI, EQ-5D and the SF-6D were 0.50 (SD 0.25), 0.69 (0.18) and 0.69 (0.13), respectively. The magnitude of difference between the PGI and the generic utility measures was large and statistically significant.ConclusionAlthough the generic utility measures included certain items that were important to people with MS, there were several that were missing. An important consequence of this mismatch was that values of QOL derived from the PGI were importantly and significantly lower than those estimated using any of the generic utility measures. This could have a substantial impact in evaluating the effect of interventions for people with MS.

Exposure to occupational and domestic pesticides, and prostate cancer risk: preliminary findings from a case-control study in Montreal, Canada.

ObjectivesTo report on the association between pesticides exposure and prostate cancer (PC) risk from PROTEuS (Prostate Cancer & Environment Study), a case-control study on-going in Montreal.MethodsIncident, histologically confirmed cases aged...

Demographic Analysis of Route Choice for Public Transit

The objective of this study was to understand the behavioral differences between various demographic categories in their choice of public transit route. Until now, almost all models have been done for the population as a whole, but this study attempted categorical choice models. The origin-destination survey in the greater Montreal, Quebec, Canada, area was used. For each trip declared, a route choice set was made and then a descriptive analysis was performed. A discrete choice model was applied for six demographic profiles, made up of two genders and three age cohorts. The results showed different coefficients for various profiles. The categorical models could better predict the behavior of individuals compared with the complete model that treated the whole population. Given the issues of aging populations in developed countries, the findings provide a new and vast insight into the future of modeling route choice for public transit.

Transcending the Typical Weekday with Large-Scale Single-Day Survey Samples

Many urban areas are increasingly experiencing significant levels of congestion where and at times when travel was once easy. In fact, the norm today is heavy congestion during off-peak periods and at weekends. However, most models and planning frameworks rely on data for the a.m. peak period for a typical weekday, and important decisions are based on their results. A better understanding of the changes occurring in metropolitan areas is required to assist in decision making, and at the same time the evolution of the data and methods used must be continuously monitored. In such a context, it is important to ask questions about specific travel behaviors on weekdays and weekend days and about how the behaviors vary throughout the year. Therefore, the concept of a typical weekday needs to be challenged for modeling purposes and updated to consist of a concept that will more thoroughly represent the complexity of travel and activity behaviors. With the benefit of the availability of the large-scale origin–destination travel surveys regularly carried out in the greater Montreal, Canada, area, this paper illustrates how such data can help assess the variability of behaviors. By using critical indicators of travel behaviors and statistical methods, this research confirms that behavior differs significantly across the days of the week.

Bridging the gap between complex data and decision-makers: an example of an innovative interactive tool

The increasing capacity of technological tools, as well as the advent of geographic information systems, has multiplied the ability to process large sets of microdata. At the same time, modeling concerns and the quest for a more in-depth understanding of individual behaviors is requiring more, and better, data. The gap between scientific modeling and informational tools for decision-making seems to be widening. In the Greater Montreal area, large sets of microdata have been available for more than 30 years. Along with the development of modeling and planning tools, particular attention has been given to the continuous enlightening of planners and decision-makers with respect to the outcomes of the various surveys. This has led to the development of particular interactive tools, specifically addressed at local planners, which present the most significant information regarding travel and demography, for geopolitically relevant areas. This paper presents the most recent interactive tool that has been developed for local planners in the Montreal area. It integrates information from both the most recent travel survey held in the region and the Canadian census. It offers both ease of use and relevant analytical means to assist in exploring the complex relations between spatial locations, demographic features, and activity-travel indicators.

Automated Detection and Location of Leaks in Water Mains Using Infrared Photography

Leakage of water distribution networks is the most common reason of undesirable losses of potable water. Problems associated with water main leaks pose growing concern around the globe. These problems include water and energy loss, in addition to the risk it poses to structural damage of adjacent properties. In current practice, not all water leaks can be detected in a timely and cost effective manner. This paper presents a study conducted for detection of water leaks in underground pipelines, and identification of their respective locations using thermography infrared camera. The paper describes the field work and the experimental protocol which were carried out over 2 years in three different locations in greater Montreal (Canada) area in order to investigate factors that affect the applicability and limitations of using IR camera in water leak detection. These factors beyond those studied in previous work carried out by American Water Works Association and National Research Council. The paper presents ...

Persistent Organic Pollutant Residues in Human Fetal Liver and Placenta from Greater Montreal, Quebec: A Longitudinal Study from 1998 through 2006

BackgroundThere is general concern that persistent organic pollutants (POPs) found in the environment, wildlife, food, water, house dust, human tissues, and fluids may alter normal human physiologic activities (e.g., fetal development, immune and endocrine systems). Although the levels of some POPs [polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCs)] in these matrices have decreased after their ban, others [polybrominated diphenyl ethers (PBDEs)] have increased in recent years.ObjectiveTo determine the longitudinal trend of specific POPs in human fetal tissues for risk assessment purposes.MethodsWe analyzed early to mid-gestation fetal liver (n = 52) and placental (n = 60) tissues, obtained after elective abortions during 1998–2006, for selected PBDEs, PCBs, and OCs using gas chromatography–mass spectroscopy.ResultsTotal PBDEs in fetal liver increased over time (mean ± SE: 1998, 284.4 ± 229.8 ng/g lipid; 2006, 1,607.7 ± 605.9; p < 0.03), whereas placental levels were generally lower, with no clear trend. Low levels of PCBs and OCs varied yearly, with no evident trend. The major analytes in 1998 were OCs (liver, 49%; placenta, 71%), whereas the major analytes in 2006 were PBDEs (liver, 89%; placenta, 98%). The 1998–2006 tissue PBDE congener profile is similar to that of DE-71, a commercial primarily pentabrominated diphenyl ether mixture manufactured in North America.ConclusionsAlthough commercial production of penta- and octa-brominated diphenyl ethers in North America was halted in 2004, their concentrations in fetal liver and placenta are now greater than the tissue burdens for the analyzed OCs and PCBs. Our findings also demonstrate that PBDEs accumulate within the fetal compartment at a very early stage in gestation.

How Many Steps Do you Have in Reserve?

The aim of this study was to estimate the benefits that people could achieve by trading their car for a nonmotorized mode of travel, such as walking, to make their short daily trips. For this purpose, detailed information on travel behavior gathered through large-scale travel surveys conducted in the greater Montreal, Quebec, Canada, area was used. The travel behavior observed in recent travel surveys was analyzed to estimate the number of short trips for various population segments. These surveys gathered travel and sociodemographic information for approximately 5% of the population. Data from the 2003 survey revealed that more than 7 million motorized trips were made during a typical weekday; 862,000 (11.7%) were shorter than 1.6 km (1 mi). With the appropriate speed and stride for each population segment, these motorized kilometers were converted into numbers of steps to appraise the potential physical activity benefits of making these short trips by foot instead of by a motorized mode. The results show that about 837,000 motorized kilometers could be converted into almost 1,156 million steps every day. Overall, 12.5% of the population had steps in reserve, an average of 2,660 steps per person. Such a shift in mode choice could help some people meet their required physical activity volumes through their daily travel patterns while helping to save energy, reduce pollution, and mitigate traffic congestion.

Strategic Management and Change in High Dependency Environments: The Case of a Philanthropic Organization

On the basis of a detailed, in-depth study of the operations and strategic decision-making of Centraide, a charitable organization in Greater Montreal, this paper suggests that dependency on the environment can be a stimulus to organizational adaptation. Two major changes over a 10-year period are studied to show that strategic management in high dependency situations requires a continual attention to the organization's relationships and interactions with the forces in its environment, and a continuous management of the process by which change takes place. The basic position advanced is that: strategy in philanthropic organizations is more effective in ensuring survival and growth when the search for autonomy is seen as irrelevant and when dependence is seen as an unavoidable fact that should shape behavior. A set of propositions helps conceptualize the findings and is offered as a guide for further research.

The Effectiveness of Flood Damage Reduction Measures in the Montreal Region

The purpose of this study is to assess the effectiveness of two flood damage reduction measures – designation and dyking of floodplains. The study was carried out in four Quebec municipalities located on the shores of Lac des Deux-Montagnes and Riviere des Mille-Iles, namely Sainte-Marthe-sur-le-Lac, Saint-Eustache, Rosemere and Bois-des-Filion. Criteria for selecting the study areas were: area of the flood-risk zone, presence or absence of dykes, presence or absence of buildings, and availability of data. The study areas were selected with the help of flood risk maps of the Greater Montreal region. In each area, information on the number of buildings and their economic value was taken from the municipality's property assessment database. Trends in the occupancy and value of floodplains were identified and compared. The results of the study show that, as in other regions of Canada, flood damage reduction measures based on designation and mapping of floodplains have had no impact on occupancy, have failed to reduce flood damages, and have not even halted increases in such damages.

Behavior and beliefs in amateur open water activities. Study of beliefs and attitudes with respect to health risks

The objective of this study was to explore beliefs, attitudes and suggestions concerning effective interventions to promote the use of sun protection, the use of personal flotation devices (PFDs) and the avoidance of contact with water unfit for swimming. Interviews were conducted with 36 users and 2 river park activity coordinators on a river in the Greater Montreal area. The respondents recognized the existence of a certain number of negative beliefs and barriers associated with the adoption of safe behaviours, in particular the pointlessness and inconvenience of means of protection against the sun and the wearing of PFDs, the negligible effects of polluted water on health and the thrill of defying bans. To help change beliefs, attitudes and behaviours, the respondents suggested legislative, organizational and individual interventions. The data gathered during this study will help to determine intervention strategies and to set up programs promoting behavioural change among the target population.

Catholic Ritual Practices, Culture and Society in Greater Montreal

According to a survey of French-speaking Catholics in Montreal, rites of passage have supplanted Sunday Mass. At the same time, Mass-goers demonstrate broad acceptance of the ritual modifications which have resulted from Vatican II. Their participation is based on an intimate religiosity, on a level considered first and foremost as the social locus of the relationship with the divine. Mass-goers are looking for an atmosphere of recollection, and Bible readings are central to services. They are reluctant to allow their religious experience to be dictated by the rite, while at the same time acknowledging the contribution its institutional character makes to the historical continuity of their belief and culture. This reluctance appears to be related more to level of education than to the frequency of their attendance at Sunday Mass.

The housing situation of refugees in Montréal three years after arrival: The case of asylum seekers who obtained permanent residence

This article presents the results of a secondary analysis of the housing-related variables contained in a survey of the settlement experiences of some 400 regularized refugee claimants living in Greater Montreal. It examines housing as a vector of settlement and integration, as well as the related neighbourhood context. The data indicate that the refugees are relatively well housed in terms of dwelling quality, but spend inordinately high percentages of their income on rent, essentially because of their low incomes. More optimistically, the refugees have access to social support from within their ethnolinguistic group, and in their neighbourhoods they are not isolated from the majority cultural groups of Quebec society.

Scheduling emergency room physicians.

This paper introduces the problem of scheduling emergency room physicians. We interviewed physicians from six hospitals in the greater Montreal, Canada area, in order to understand the emergency room scheduling problem. Extracting the real scheduling problem is difficult because physician working conditions are based on informal mutual cooperation which is usually not documented. We present the characteristics of the scheduling problem and the scheduling techniques currently used in the six emergency rooms we analyzed. Using the scheduling problems of Charles-Lemoyne Hospital and the Jewish General Hospital, we show how to modify a hospital's existing scheduling rules to develop techniques which produce better schedules and reduce the time needed to build them.

Splendeurs Et Misères De La Concertation Locale En Santé Mentale: Un Regard Du Terrain

Collaboration among public and community resources (or concentration as it is referred to in French) is a practice much favoured by governments for ideological and economic reasons. But if administrative collaboration is relatively easy to set up, what about collaboration among front-line field workers? What are the ingredients likely to engender true collaboration among practitioners, and what obstacles do they meet with on a practical day-to-day level? Experience acquired in the West Island area of greater Montreal has led us to the conclusion that many issues need to be examined and understood: the difficulty of reconciling client empowerment with treatment; the difficulty of harmonizing the values and convictions prevailing in institutional and community-based networks; the tendency for practitioners to keep clienteles for themselves within a treatment environment. Despite these difficulties, it is evident that there will be a trend towards increasing collaboration where clienteles are growing and where problems are becoming more complex.

Metal accumulation in American wild celery (Vallisneria americana Michx.) in the St. Lawrence River: effects of water depth and exposure to current

The sensitivity of Vallisneria americana Michx. as an indicator species of metal concentrations was assessed through the examination of its spatial (between- and within-site) and temporal (short- and long-term) variability. Eight macrophyte beds located in the St. Lawrence and Ottawa rivers were selected to contrast metal concentrations found in plants exposed to different types of waters, upstream and downstream of their confluence, in the Greater Montreal urban area. Comparisons among sites revealed higher metal concentrations, both in water and in plant tissues, at sites exposed to Ottawa River "brown" waters than at sites exposed to St. Lawrence River "green" waters. Within each site, samples represented a broad range in terms of water depths, exposure to current, incident light intensity, and total plant biomass. At all sites, metal concentrations in plant tissues were lowest in the shallow water found in sheltered, dense beds of submerged aquatic vegetation and increased in deep, open-water areas beyond the limits of dense vegetation. This persistent gradient may result from local differences in plant growth rates, exposure to currents, and (or) metal bioavailability. The use of a sampling strategy designed to control for within-site (depth-balanced) variability makes it possible to measure spatial and (or) temporal differences on the order of 20% whereas unbalanced sampling designs may lead to erroneous conclusions. Significant reductions in metal concentrations in plant tissue were observed both between 1994 and 1996 (Fe, Mn, Pb, Zn, N) and between 1976 and 1996 (Cd, Cr, Pb, Zn, N). Particular care must be given to sampling design if V. americana is to be used as a biological indicator of further long-term reductions in metal concentrations.

Epidemiology of sociodemographic characteristics, lifestyle, medical history, and colon cancer: a case-control study among French Canadians in Montreal.

Colon cancer is the second most common cancer in both men and women in North America and other developed countries. In a population-based case-control study of colon cancer among French Canadians in greater Montreal, a total of 402 cases and 668 controls were interviewed. The cancer cases were identified through the admission offices of five major Francophone teaching hospitals in Montreal from 1989 to 1993. The controls, matched by age, sex, place of residence, and language, were selected by a modified random digit dialing method. The results show that subjects who had ever been married had a lower risk for colon cancer (odds ratio [OR]: 0.58; 95% confidence interval [95% CI]: 0.48-0.84) than did individuals who had never been married. A significant association (OR: 1.90; p for trend = 0.003) was found between the height of subjects and the risk of colon cancer. The OR for individuals with a family history of colorectal cancer was 2.78 with a p value of 0.01. A direct and significant association (OR: 2.01) was found among constipation, use of laxatives (OR: 1.41), and the risk of colon cancer. Among women, a suggestive inverse association was detected between the number of full-term pregnancies and the risk of colon cancer in female subjects (the OR for five or more pregnancies was 0.58 with a p for trend of 0.08). There was also a suggestive linear trend (increased age-decreased risk) between age at menarche and the risk of colon cancer. No association was apparent between other sociodemographic characteristics and the risk of colon cancer. In conclusion, married individuals had lower risk for colon cancer, perhaps due to food habits or other characteristics of being single. Higher height and weight history 10 years before the diagnosis of cancer are risk factors for breast cancer, while both current weight and body mass index seem to be protective. Positive family history of colon cancer increased the risk of colon cancer significantly.