Adherence to secondary stroke prevention strategies - Results from the German stroke data bank

Only very limited data are available concerning patient adherence to antithrombotic medication intended to prevent a recurrent stroke. Reduced adherence and compliance could significantly influence the effects of any stroke prevention strategies. This study from a large stroke data bank provides representative data concerning the rate of stroke victims adhering to their recommended preventive medication. During a 2-year period beginning January 1, 1998, all patients with acute stroke or TIA in 23 neurological departments with an acute stroke unit were included in the German Stroke Data Bank. Data were collected prospectively, reviewed, validated and processed in a central data management unit. Only 12 centers with a follow-up rate of 80% or higher were included in this evaluation. 3,420 patients were followed up after 3 months, and 2,640 patients were followed up one year after their stroke. After one year, 96% of all patients reported still adhere to at least one medical stroke prevention strategy. Of the patients receiving aspirin at discharge, 92.6% reported to use that medication after 3 months and 84% after one year, while 81.6 and 61.6% were the respective figures for clopidogrel, and 85.2 and 77.4% for oral anticoagulation. Most patients who changed medication switched from aspirin to clopidogrel. Under the conditions of this observational study, adherence to stroke prevention strategies is excellent. The highest adherence rate is noticed for aspirin and oral anticoagulation. After one year, very few patients stopped taking stroke preventive medication. Copyright (C) 2003 S. Karger AG, Basel

Scale effect in hazard assessment - application to daily rainfall

International audienceDaily precipitation is recorded as the total amount of water collected by a rain-gauge in 24h. Events are modelled as a Poisson process and the 24h precipitation by a Generalized Pareto Distribution (GPD) of excesses. Hazard assessment is complete when estimates of the Poisson rate and the distribution parameters, together with a measure of their uncertainty, are obtained. The shape parameter of the GPD determines the support of the variable: Weibull domain of attraction (DA) corresponds to finite support variables, as should be for natural phenomena. However, Fréchet DA has been reported for daily precipitation, which implies an infinite support and a heavy-tailed distribution. We use the fact that a log-scale is better suited to the type of variable analyzed to overcome this inconsistency, thus showing that using the appropriate natural scale can be extremely important for proper hazard assessment. The approach is illustrated with precipitation data from the Eastern coast of the Iberian Peninsula affected by severe convective precipitation. The estimation is carried out by using Bayesian techniques

Temporal Use Patterns of Wintering Starlings at a Southeastern Livestock Farm: Implications for Damage Control

The farm use patterns of individually marked and transmitter-equipped starlings at a livestock farm in south-central Kentucky were studied each month during the principal damage period (December-February) of 1982-83 and 1984-85 following a pilot study in January and February of 1980. In addition to intensive observation at the farm, sightings of tagged starlings away from the farm were solicited from the public and mapped. For each year of data on individual starlings that used the farm at least once after marking, the expected frequencies of farm occurrence were calculated and compared to observed frequencies. In all 3 years, there was a significant (P \u3c 0.01) heterogeneity among birds in their frequency of farm use. The observed frequencies of daily farm use appeared bimodal suggesting starling subpopulations of frequent versus infrequent farm users. The preponderance of individuals occurred at the farm infrequently. Analysis of starling foraging patterns indicated that frequent farm visitors were also likely to use livestock feed sites more often than infrequent visitors. In 1984-85 the monthly starling turnover at the farm was calculated at 70.3% from December to January and 67.4% from January to February. Data on marked starling sightings away from the farm indicated that these individuals only moved a median distance of only 2.7 km from the farm suggesting a strong fidelity to their foraging area near the farm. The management implications of these data are discussed relative to integrated strategies of starling damage reduction at livestock farms in the southeastern United States

The normal distribution in some constrained sample spaces

Phenomena with a constrained sample space appear frequently in practice. This is the case, for example, with strictly positive data, or with compositional data, such as percentages or proportions. If the natural measure of difference is not the absolute one, simple algebraic properties show that it is more convenient to work with a geometry different from the usual Euclidean geometry in real space, and with a measure different from the usual Lebesgue measure, leading to alternative models that better fit the phenomenon under study. The general approach is presented and illustrated using the normal distribution, both on the positive real line and on the D-part simplex. The original ideas of McAlister in his introduction to the lognormal distribution in 1879, are recovered and updated

Et Par Ord om Runkelroesukkers Tilvirkning i det Smaa.

Et Par Ord om Runkelroesukkers Tilvirkning i det Smaa

Possible Effects of Catfish Exploitation on Overwinter Body Condition of Double-Crested Cormorants

Concurrent with the rapid growth of the Mississippi catfish industry during the 1980’s, there was evidence of similar growth of double-crested cormorant (Phalacrocorax auritus) populations wintering in the delta region of Mississippi. Observational and food habits studies indicate that this expansive industry, incorporating more than 100,000 acres of ponds, provides an enormous food base for overwintering populations estimated in recent years to exceed 50,000 birds. As much as 75 percent of the diet in certain roosting areas of the Mississippi delta consisted of catfish, and according to bioenergetic models cormorants can exploit as much as 940 metric tons of catfish per winter. Despite these data, there has been little attempt to demonstrate whether exploitation of this food base has increased body condition and possibly survival of wintering cormorants that return primarily to the Great Lakes region to breed. To examine this possible effect, we analyzed monthly changes in body masses of wintering cormorants collected in the delta region of Mississippi and compared premigratory body masses and fat deposition of Mississippi cormorants with those from areas without extensive aquaculture production. With the exception of adult females, all sex and age groups of cormorants collected in the delta during the winters of 1989– 90 and 1990–91 increased (P \u3c 0.05) their body mass from November to April. Over all months, body masses of adult males and adult females were greater than that of subadults. Standardized by wing chord length, the premigratory body masses of Mississippi males and females differed (P \u3c 0.0004) from premigratory males and females collected from Alabama in areas remote from catfish production. Premigratory fat deposition appeared to be responsible for the body mass increases, and omental fat mass was highly correlated (R = 0.721, P \u3c 0.0001) with body mass and also differed (P = 0.0003) between Mississippi and Alabama birds. We hypothesize that the improved body condition of cormorants resulting from exploiting catfish has increased their survival and contributed to the population explosion of cormorants observed over the past decade. We suggest additional studies to substantiate our findings and to clarify the importance of southern aquaculture on improving body condition and survival of cormorants

Possible Effects of Catfish Exploitation on Overwinter Body Condition of Double-Crested Cormorants

Concurrent with the rapid growth of the Mississippi catfish industry during the 1980’s, there was evidence of similar growth of double-crested cormorant (Phalacrocorax auritus) populations wintering in the delta region of Mississippi. Observational and food habits studies indicate that this expansive industry, incorporating more than 100,000 acres of ponds, provides an enormous food base for overwintering populations estimated in recent years to exceed 50,000 birds. As much as 75 percent of the diet in certain roosting areas of the Mississippi delta consisted of catfish, and according to bioenergetic models cormorants can exploit as much as 940 metric tons of catfish per winter. Despite these data, there has been little attempt to demonstrate whether exploitation of this food base has increased body condition and possibly survival of wintering cormorants that return primarily to the Great Lakes region to breed. To examine this possible effect, we analyzed monthly changes in body masses of wintering cormorants collected in the delta region of Mississippi and compared premigratory body masses and fat deposition of Mississippi cormorants with those from areas without extensive aquaculture production. With the exception of adult females, all sex and age groups of cormorants collected in the delta during the winters of 1989– 90 and 1990–91 increased (P \u3c 0.05) their body mass from November to April. Over all months, body masses of adult males and adult females were greater than that of subadults. Standardized by wing chord length, the premigratory body masses of Mississippi males and females differed (P \u3c 0.0004) from premigratory males and females collected from Alabama in areas remote from catfish production. Premigratory fat deposition appeared to be responsible for the body mass increases, and omental fat mass was highly correlated (R = 0.721, P \u3c 0.0001) with body mass and also differed (P = 0.0003) between Mississippi and Alabama birds. We hypothesize that the improved body condition of cormorants resulting from exploiting catfish has increased their survival and contributed to the population explosion of cormorants observed over the past decade. We suggest additional studies to substantiate our findings and to clarify the importance of southern aquaculture on improving body condition and survival of cormorants