Are food exposures obtained through commercial market panels representative of the general population? Implications for outbreak investigations

Current methods of control recruitment for case-control studies can be slow (a particular issue for outbreak investigations), resource-intensive and subject to a range of biases. Commercial market panels are a potential source of rapidly recruited controls. Our study evaluated food exposure data from these panel controls, compared with an established reference dataset. Market panel data were collected from two companies using retrospective internet-based surveys; these were compared with reference data from the National Diet and Nutrition Survey (NDNS). We used logistic regression to calculate adjusted odds ratios to compare exposure to each of the 71 food items between the market panel and NDNS participants. We compared 2103 panel controls with 2696 reference participants. Adjusted for socio-demographic factors, exposure to 90% of foods was statistically different between both panels and the reference data. However, these differences were likely to be of limited practical importance for 89% of Panel A foods and 79% of Panel B foods. Market panel food exposures were comparable with reference data for common food exposures but more likely to be different for uncommon exposures. This approach should be considered for outbreak investigation, in conjunction with other considerations such as population at risk, timeliness of response and study resources

CONSUMER UNDERSTANDING AND USE OF HEALTH INFORMATION ON PRODUCT LABELS: MARKETING IMPLICATIONS FOR FUNCTIONAL FOOD

In recent years, the numbers of functional foods being developed and subjected to scientific evaluation have increased substantially. The main characteristic of functional foods that distinguishes them from conventional foods is the potential health benefit, which can be considered to be a credence attribute of product quality. Because this characteristic cannot be easily assessed even after consumption, an asymmetric information environment for health benefits has emerged where producers have more information than consumers. Thus the government intervenes by regulating the provision of health information on product labels in order to avoid potential market failures. The Food and Drug Administration (FDA) recently amended the way health claims on labels of conventional food and dietary supplements are managed. The new policy on qualified health claims allows claims to be made based on different levels of supporting scientific evidence. The policy goal is to encourage firms to make accurate, science-based claims about the health benefits of their products while helping consumers prevent disease and improve their health through sound dietary decisions using nutrition information. This marks a break from the previous environment where a lengthy approval process was argued to provide a road block for food firms wanting to market functional foods based on emerging evidence of diet to health links. This study has two objectives. First, to determine how consumers use health and nutrition information on food labels to form judgments about product quality, using the Elaboration Likelihood Model (ELM) as a theoretical framework. Second, to examine whether consumers can differentiate various levels of health claims, specifically the new qualified language, approved by FDA in 2003. It is interesting to determine whether consumers understand the different levels of scientific evidence supporting such claims and whether they can distinguish between the disclaimer languages used. Understanding how consumers use health and nutrition information on product labels has implications for both public policy and food manufacturers who use health claims as tools to market their products e.g., functional foods. This study used a still hypothetical functional food product a wheat cracker containing soy protein. It has been shown that soluble fiber and isoflavones, which can be found in wheat and soy products, respectively, independently help prevent the risk of several maladies including cancer and heart disease. A 5 (claim information on the front label a control condition and the four levels of qualified health claim) x 2 (information on Nutrition Facts) between-subjects factorial design was applied. Five versions of claim information were manipulated, including a control condition and four levels of qualified health claim. Each claim contained explicit relationships between nutrients and diseases i.e., isoflavones - heart disease and soluble fiber - cancers, but had different disclaimers explaining the level of scientific evidence supporting the claim. A report card was also included to inform consumers about the various claim levels, ranging from level A to D. Information on the Nutrition Facts panel was manipulated representing a "healthy" and an "unhealthy" version. Three hundred and seventy-two undergraduate students participated in the study, receiving extra credit for a Marketing class. Several multi-item scales are used as dependent variables, including attitude toward the product, buying intention, strength of evaluation about scientific studies to support claim, confidence about claim statement, perception of product's health benefit, and information search. A univariate analysis of variance (ANOVA) is conducted to test main and interaction effects among independent variables on a dependent variable. The results of this study suggest that consumers pay attention to information from all sources including the front label and Nutrition Facts panel. Even though it is shown that consumers react more positively to versions with health claims, there is no evidence to support the first hypothesis that consumers are more careful in evaluating product quality when health and nutrition information is present on the front package. Nevertheless, consumers are able to differentiate healthy products from unhealthy products, regardless of the presence of health and nutrition information on the front label. This study examines whether consumers understand and can distinguish various levels of qualified health claims. Although evidence suggests that consumers react differently to various claim levels, it is not clear whether people understand differences in the scientific support of these claims, as described in the disclaimer. Despite an increasing trend in attitude and purchase intention from the weakest claim (level D) to the strongest claim (level A), there is no statistically significant difference among claim levels when using measures of evaluation of strength of scientific studies, confidence about claim information, and perception of product's health benefit. From the public policy perspective, the results of this study can help determine how consumers evaluate health and nutrition information. It is shown that consumers do not overlook information from other parts of the label specifically the Nutrition Facts panel and that the presence of health and nutrition information on the front label is not likely to mislead consumers. The key issue here that needs further investigation is how to effectively provide information on the front label to consumers. FDA's goal is to permit the use of more, better, easily understood, and up-to-date scientific information about how dietary choices can affect consumers' health on food labels. It is important to identify optimal levels of qualified health claims, perhaps only two levels instead of four levels, so that consumers can distinguish and understand differences in terms of the scientific support for the claims and product benefits. As for the food industry, the results of this study can help food manufacturers decide what level of health and nutrition information they should provide to consumers. In addition to understanding the petitioning procedures for different claims, food firms must determine which, how, and when consumers understand and use health information in order to find the most efficient marketing communication channels.Health Economics and Policy,

Development of a Mammal Hair Identification Guide for Common Species in New York

Identifying mammals by hair characteristics is valuable for wildlife management applications, law enforcement, and regulation of international treaties. Researchers use hair identification in scat-and gastrointestinal-based diet studies, genetic-based hair-snare collections, and monitoring trade of rare and protected species. No accessible mammalian hair identification key exists for New York or other northeastern states. Identification keys are beneficial for researchers, wildlife managers and interested members of the general public that attempt to identify specific taxa. We created a guard-hair identification key for common mammalian species in New York State. This key was needed to identify diet components during a suburban coyote study. We collected hair samples of common mammal species in New York from private fur collections, road-killed specimens, and museum archives. Hair samples were characterized using 10 categorical variables. We then used single-fusion, hierarchical cluster analysis (Program JMP 7.0) to rapidly facilitate the identification of unique patterns, similarities, and dissimilarities of the hair characteristics. This statistical-based analysis produced a dendrogram that was used as a road map for the structural organization of the hair key. JMP\u27s dynamical interface allowed us to select specific branches of the dendrogram, thus highlighting the observations in the data table, and quickly identifying the important characteristics that differentiated mammal groupings and subsets. This is a new application of a multivariate technique, hierarchical cluster analysis, to rapidly develop a mammalian guard-hair identification key. This method could be used to develop locally-customized identification keys for wildlife damage research and management

Behavioral Ecology and Management of Suburban Coyotes in Westchester County, New York

The coyote (Canis latrans) is now established as a relatively common inhabitant of nearly all landscapes in the northeastern United States. However, the ecology and management of this larger, mid-sized carnivore in urban areas is poorly understood, and creates much uncertainty for residents and wildlife managers alike. Detailed behavioral ecology studies are important to understand the role of the coyote in urbanized landscapes and their interactions with humans. We are studying the behavioral ecology of coyotes in Westchester County, N.Y., a predominantly urban county directly north of New York City. We investigated the diet of coyotes through trail-based fecal collections to identify potential anthropogenic food items that could lead to negative human-coyote interactions. Concurrently, we examined the spatial ecology of coyotes using both VHF-and GPS-based telemetry. Preliminary results from the diet analysis indicated that \u3e50% of the scats collected contained white-tailed deer (Odocoileus virginianus) remains. Other natural food items accounted for most of the remaining food items. No domestic dog remains have been identified in scats and only 4 scats contained domestic cat remains-3 of which were collected during the same day along the same collection trail. Spatial ecology data indicated that coyote home ranges (n = 26) averaged 5.53 km2 ± 3.18 SD, and ranged from 1.16-12.02 km2. Habitat use revealed that 71% of coyote locations (n = 1,987) were in natural lands, and 28% were in residential, recreational and agricultural areas. While these findings indicated the risk for negative interactions was lower than for other areas of the U.S., potential does remain for conflicts to occur. Overall, resident coyotes appear to be living natural lives and remain embedded in natural processes, while avoiding human interactions in developed landscapes

Moon-tracking orbits using motorized tethers for continuous earth–moon payload exchanges

For human colonization of the moon to become reality, an efficient and regular means of exchanging resources between the Earth and the moon must be established. One possibility is to pass and receive payloads at regular intervals between a symmetrically laden motorized momentum-exchange tether orbiting about Earth and a second orbiting about the moon. There are significant challenges associated with this method, among the greatest of which is the development of a system that incorporates the complex motion of the moon into its operational architecture in addition to conducting these exchanges on a per-lunar-orbit basis. One way of achieving this is to use a motorized tether orbiting Earth and tracking the nodes of the moon’s orbit to allow payload exchanges to be undertaken periodically with the arrival of the moon at either of these nodes. Tracking these nodes is achieved by arranging the tether to orbit Earth with a critical inclination, thus rendering its argument of perigee stationary in addition to using the precession effects resulting from an oblate Earth. Using this in conjunction with pre-emptive adjustments to its angle of right ascension, the tether will periodically realign itself with these nodes simultaneously with the arrival of the moon

Colliding axisymmetric pp-waves

An exact solution is found describing the collision of axisymmetric pp-waves with M=0. They are impulsive in character and their coordinate singularities become point curvature singularities at the boundaries of the interaction region. The solution is conformally flat. Concrete examples are given, involving an ultrarelativistic black hole against a burst of pure radiation or two colliding beam- like waves.Comment: 6 pages, REVTeX, some misprints are correcte