bluuebunny/crossref_metadata_2025_split huggingface dataset:
Uses and limitations of statistical accounting for random error correlations, in the validation of dietary questionnaire assessments
Authors: Kaaks Rudolf , Ferrari Pietro , Ciampi Antonio , Plummer Martyn , Riboli Elio 
Published: July 2003

AbstractObjective:To examine statistical models that account for correlation between random errors of different dietary assessment methods, in dietary validation studies.Setting:In nutritional epidemiology, sub-studies on the accuracy of the dietary questionnaire measurements are used to correct for biases in relative risk estimates induced by dietary assessment errors. Generally, such validation studies are based on the comparison of questionnaire measurements (Q) with food consumption records or 24-hour diet recalls (R). In recent years, the statistical analysis of such studies has been formalised more in terms of statistical models. This made the need of crucial model assumptions more explicit. One key assumption is that random errors must be uncorrelated between measurements Q and R, as well as between replicate measurements R1 and R2 within the same individual. These assumptions may not hold in practice, however. Therefore, more complex statistical models have been proposed to validate measurements Q by simultaneous comparisons with measurements R plus a biomarker M, accounting for correlations between the random errors of Q and R.Conclusions:The more complex models accounting for random error correlations may work only for validation studies that include markers of diet based on physiological knowledge about the quantitative recovery, e.g. in urine, of specific elements such as nitrogen or potassium, or stable isotopes administered to the study subjects (e.g. the doubly labelled water method for assessment of energy expenditure). This type of marker, however, eliminates the problem of correlation of random errors between Q and R by simply taking the place of R, thus rendering complex statistical models unnecessary.
Erythrocyte cell membrane phospholipid levels compared against reported dietary intakes of polyunsaturated fatty acids in pregnant Mexican women
Authors: Parra Maria-Socorro , Schnaas Lourdes , Meydani Mohsen , Perroni Estela , Martíanez Sandra , Romieu Isabelle 
Published: July 2003

AbstractObjective:To evaluate the validity of a food-frequency questionnaire (FFQ) for assessment of the dietary intakes of polyunsaturated fatty acids (PUFAs) against a biochemical marker of fat intake, erythrocyte cell membrane phospholipid levels, during pregnancy.Design:Cross-sectional analysis.Setting:Developmental Neurobiology Department, National Institute of Perinatology, Mexico City.Subjects:One hundred forty-six healthy pregnant women during the last trimester of pregnancy. Among women enrolled, the first 35 pregnant women (24%) had their erythrocytes analysed for fatty acid status.Methods:We administered an FFQ and compared intakes of PUFAs against their erythrocyte cell membrane concentrations, processed by gas chromatography.Results:Pearson correlation coefficients among α-linolenic acid (ALN), docosahexaenoic acid (DHA) and eicosapentaenoic acid in erythrocyte cell membranes against their crude dietary counterparts were 0.32, 0.35 and 0.36 (each P < 0.05). In a simple linear regression, erythrocyte DHA and arachidonic acid (AA) were significantly related to their respective dietary intakes (β = 0.30, 95% confidence interval (CI): 0.007–0.60, P = 0.045 for DHA; β = 0.49, 95% CI: 0.010–0.98, P = 0.044 for AA). Erythrocyte cell membrane ALN concentration (%/total) was only marginally related to ALN dietary intake (mg day−1) (β = 0.52, 95% CI: −0.020–1.10, P = 0.061). However, after adjustment for long-chain n–3 PUFA/AA, this association reached significance (β = 0.44, 95% CI: 0.026–0.825, P = 0.038). Main dietary sources for n–3 PUFAs were canned tuna fish and fresh catfish; for n–6 these were eggs and cow's milk. The use of this FFQ in these pregnant Mexican women provided estimates of average long-term intakes of PUFAs and correlated reasonably well with their erythrocyte cell membrane phospholipid status. However, we need to consider that, during pregnancy, there is a faster turnover of PUFAs from fat storage that may modify the profile of erythrocyte PUFAs and lower the correlation between dietary intake and erythrocyte PUFAs.
Bias in dietary-report instruments and its implications for nutritional epidemiology
Authors: Kipnis Victor , Midthune Douglas , Freedman Laurence , Bingham Sheila , Day Nicholas E , Riboli Elio , Ferrari Pietro , Carroll Raymond J 
Published: July 2003

AbstractObjective:To evaluate measurement error structure in dietary assessment instruments and to investigate its implications for nutritional studies, using urinary nitrogen excretion as a reference biomarker for protein intake.Design:The dietary assessment methods included different food-frequency questionnaires (FFQs) and such conventional dietary-report reference instruments as a series of 24-hour recalls, 4-day weighed food records or 7-day diaries.Setting:Six original pilot validation studies within the European Prospective Investigation of Cancer (EPIC), and two validation studies conducted by the British Medical Research Council (MRC) within the Norfolk cohort that later joined as a collaborative component cohort of EPIC.Subjects:A sample of approximately 100 to 200 women and men, aged 35–74 years, from each of eight validation studies.Results:In assessing protein intake, all conventional dietary-report reference methods violated the critical requirements for a valid reference instrument for evaluating, and adjusting for, dietary measurement error in an FFQ. They displayed systematic bias that depended partly on true intake and partly was person-specific, correlated with person-specific bias in the FFQ. Using the dietary-report methods as reference instruments produced substantial overestimation (up to 230%) of the FFQ correlation with true usual intake and serious underestimation (up to 240%) of the degree of attenuation of FFQ-based log relative risks.Conclusion:The impact of measurement error in dietary assessment instruments on the design, analysis and interpretation of nutritional studies may be much greater than has been previously estimated, at least regarding protein intake.
Assessing the dietary environment: examples from school-based nutrition interventions
Authors: Lytle Leslie A , Fulkerson Jayne A 
Published: July 2003

AbstractObjective:The objectives of this paper are to (1) introduce the concept of upstream and downstream public health approaches and discuss diet assessment issues in that context, and (2) provide examples of diet assessment methods and challenges in assessing environmental factors influencing eating patterns.Design:Dietary assessment of environmental factors is discussed as they relate to nutrition interventions for school-aged children, although the issues transcend population characteristics. Examples of assessment challenges in measuring ‘dietary environments’ are drawn from the Child and Adolescent Trial for Cardiovascular Health (CATCH), Teens Eating for Energy and Nutrition at School (TEENS) and Trying Alternative Cafeteria Options in Schools (TACOS) studies.Results/conclusions:The healthfulness of our ‘dietary environments’ (which may include food availability, social norms around food choice and the effect of pricing, policy and promotion on food choice) may be more important in determining what people consume than their individual decision-making about food choice. There is a dearth of published information to inform us on how to assess these ‘dietary environments’.
Issues in the development and use of food composition databases
Authors: Puwastien Prapasri 
Published: July 2003

AbstractObjectives:To share experience on the development of national and regional food composition tables (FCTs) and the issues and problems involved.Design:Food composition data analysed at national and regional levels were compiled. Systematic development of FCTs detailing specific criteria and characteristics following the INFOODS and ASEANFOODS guidelines was conducted.Setting:The national FCT was developed using the Thai FCT as a study model. For the regional level, the Association of South East Asian Nations (ASEAN) FCT was developed.Subjects:About 3000 analysed datasets of about 1000 food items on proximate composition, minerals, vitamins and other available components from various sources in Thailand and about 4500 analysed datasets of 1700 food items on the same components from various countries in ASEAN were compiled. The national and regional FCTs were then developed systematically.Results:The developed Thai FCT contains 24 nutrients of 1055 food items and the ASEAN FCT contains 21 nutrients of about 1740 food items. Issues and problems regarding the development and use of national and regional food composition data are listed.Conclusion:Food composition databases have become increasingly important in the international health arena. Systematic compilation of the data is necessary and the use of INFOODS tag names is strongly recommended. This is to indicate the methods of nutrient analysis and calculation, and to facilitate international and regional data interchange. Users are also recommended to read theExplanatory Notes and Information to the Users.Collaboration among data generators, users and compilers at national and regional levels, as well as support from international organisations, is essential.
Procedures for screening out inaccurate reports of dietary energy intake
Authors: Mccrory Megan A , Hajduk Cheryl L , Roberts Susan B 
Published: July 2003

AbstractObjective:To review existing methods and illustrate the use of a new, simple method for identifying inaccurate reports of dietary energy intake (rEI).Design:Comparison of rEI with energy requirements estimated by using total energy expenditure predicted (pTEE) from age, weight, height and sex using a previously published equation. Propagation of error calculations was performed and cut-offs for excluding rEI at plus or minus two standard deviations (±2 SD) and ±1 SD for the agreement between rEI and pTEE were established.Setting:Dietary survey in a US national cohort: the Continuing Survey of Food Intakes by Individuals (CSFII), 1994–96.Subjects:Men and non-pregnant, non-lactating women aged 21–45 years in the CSFII who provided two multiple-pass 24-hour recalls, height and weight(n = 3755).Results:Average rEI was 77% of pTEE in men, and 64% of pTEE in women. Calculated cut-offs were rEI <40% or >160% of pTEE (±2 SD) and <70% or >130% of pTEE (±1 SD), respectively. Use of only the ±1 SD cut-offs, not the ±2 SD cut-offs, resulted in a relationship between rEI and body weight similar to what was expected (based on an independently calculated relationship between rEI and measured TEE). Exclusion of rEI outside either the ±2 SD (11% of subjects) or ±1 SD (57% of subjects) cut-offs did not affect mean reported macronutrient intakes, but did markedly affect relationships between dietary composition and body mass index.Conclusions:When examining relationships between diet and health, use of ±1 SD cut-offs may be preferable to ±2 SD cut-offs for excluding inaccurate dietary reports.
Measuring food intake in studies of obesity
Authors: Lissner Lauren 
Published: July 2003

AbstractThe problem of how to measure habitual food intake in studies of obesity remains an enigma in nutritional research. The existence of obesity-specific underreporting was rather controversial until the advent of the doubly labelled water technique gave credence to previously anecdotal evidence that such a bias does in fact exist. This paper reviews a number of issues relevant to interpreting dietary data in studies involving obesity. Topics covered include: participation biases, normative biases, importance of matching method to study, selective underreporting, and a brief discussion of the potential implications of generalised and selective underreporting in analytical epidemiology. It is concluded that selective underreporting of certain food types by obese individuals would produce consequences in analytical epidemiological studies that are both unpredictable and complex. Since it is becoming increasingly acknowledged that selective reporting error does occur, it is important to emphasise that correction for energy intake is not sufficient to eliminate the biases from this type of error. This is true both for obesity-related selective reporting errors and more universal types of selective underreporting, e.g. foods of low social desirability. Additional research is urgently required to examine the consequences of this type of error.
Dietary Reference Intakes: summary of applications in dietary assessment
Authors: Murphy Suzanne P , Poos Mary I 
Published: July 2003

AbstractObjective:To summarise the applications and appropriate use of Dietary Reference Intakes (DRIs) as guidance for nutrition and health research professionals in the dietary assessment of groups and individuals.Design:Key points from the Institute of Medicine report, Dietary Reference Intakes: Applications in Dietary Assessment, are summarised in this paper. The different approaches for using DRIs to evaluate the intakes of groups vs. the intakes of individuals are highlighted.Results:Each of the new DRIs is defined and its role in the dietary assessment of groups and individuals is described. Two methods of group assessment and a new method for quantitative assessment of individuals are described. Illustrations are provided on appropriate use of the Estimated Average Requirement (EAR), the Adequate Intake (AI) and the Tolerable Upper Intake Level (UL) in dietary assessment.Conclusions:Dietary assessment of groups or individuals must be based on estimates of usual (long-term) intake. The EAR is the appropriate DRI to use in assessing groups and individuals. The AI is of limited value in assessing nutrient adequacy, and cannot be used to assess the prevalence of inadequacy. The UL is the appropriate DRI to use in assessing the proportion of a group at risk of adverse health effects. It is inappropriate to use the Recommended Dietary Allowance (RDA) or a group mean intake to assess the nutrient adequacy of groups.
Dietary assessment tools for developing countries for use in multi-centric, collaborative protocols
Authors: Solomons Noel W , Valdés-Ramos Roxana 
Published: July 2003

AbstractIn recent years, increasing interest in the format of multi-centric studies among different populations in developing nations has evolved in the field of health surveys and epidemiology. Dietary intake data are most often part of these cross-cultural and cross-national collaborative efforts. Various questions have been raised about the appropriate endeavours for dietetics and nutritional sciences in developing societies, the instruments available for application, and the pitfalls and caveats in their use. An important consideration is that studies be hypothesis-driven and not mere ‘fishing expeditions’ of unfocused data gathering. All known dietary intake measurement tools are within the purview of developing country research, but they often must be adapted individually and differentially to suit a given population. In a multi-centric context, this is complicated. The watchword should be collecting comparable information across sites, not using identical approaches. Choice of dietary intake measurement tools must be honed to the hypotheses and assumptions, on the one hand, and the exigencies and pitfalls of working in the developing country milieu, in which linguistics, seasonality, migration, uncommonness of food systems and ethical considerations present barriers and caveats, on the other. Within the hypotheses, the assumptions regarding the penetration of the measured exposures must be borne in mind. Multi-centre studies in developing countries have relevance and importance in the context of food security, diet and disease, eating behaviour and satiety regulation, and nutritional anthropology.
Biomarkers and the measurement of fatty acids
Authors: Arab Lenore , Akbar Jabar 
Published: July 2003

AbstractObjective:To review the various biomarkers of dietary intakes of fatty acids in human populations, their measurement, limitations and analytical considerations.Design:Review of the literature.Results:Although there is no good biomarker of intake of total fat, a number of alternatives exist for assessing the intakes of exogenously produced fatty acids that are consumed. Adipose tissue, erythrocyte membrane concentrations and serum or plasma levels can reflect prior intakes over the past few hours to the past few years. The concentrations of individual fatty acids in these media generally reflect relative levels, and are influenced by a number of factors. Although relatively expensive to analyse, a single analysis by gas chromatography or high-performance liquid chromatography provides information on multiple fatty acids, and is superior to attempting to measure specific fatty acids using traditional dietary assessment methods.Conclusions:Biomarkers of fatty acids that reflect long-term intake are available for nutritional epidemiology purposes. Analytical methods have become very accurate and able to detect and quantify smaller families, such as trans-fatty acids.
Looking Back: Exploring the Psychology of Queuing and the Effect of the Number of People Behind
Authors: Zhou Rongrong , Soman Dilip 
Published: July 2003

Abstract
Queues are a ubiquitous phenomenon. This research investigates consumers' affective experiences in a queue and their decisions to leave the queue after having spent some time in it (reneging). In particular, we find in our first two studies that, as the number of people behind increases, the consumer is in a relatively more positive affective state and the likelihood of reneging is lower. While a number of explanations may account for this effect, we focus on the role of social comparisons. In particular, we expect consumers in a queue to make downward comparisons with the less fortunate others behind them. We propose that three types of factors influence the degree of social comparisons made and thus moderate the effect of the number behind: (a) queue factors that influence the ease with which social comparisons can be made, (b) individual factors that determine the personal tendency to make social comparisons, and (c) situational factors that influence the degree of social comparisons through the generation of counterfactuals. Across three studies, we find support for each moderating effect. We conclude with a discussion on theoretical implications and limitations, and we propose avenues for future research.
Typologies of agreement: some problems from Kayardild
Authors: Evans Nicholas 
Published: July 2003

‘that rarity, nouns…, those most reluctant agreers, aggreeing in case, of all categories’ (Plank 1995: 32)In this paper I describe a number of agreement‐type phenomena in the Australian language Kayardild, and assess them against existing definitions, stating both the boundaries of what is to be considered agreement, and characteristics of prototypical agreement phenomena. Though conforming, prima facie, to definitions of agreement that stress semantically based covariance in inflections on different words, the Kayardild phenomena considered here pose a number of challenges to accepted views of agreement: the rich possibilities for stacking case‐like agreement inflections emanating from different syntactic levels, the fact that inflections resulting from agreement may change the word class of their host, and the semantic categories involved, in particular tense/aspect/mood, which have been claimed not to be agreement categories on nominals. Two types of inflection, in particular—‘modal case’ and ‘associating case’—lie somewhere between prototypical agreement and prototypical government. Like agreement, but unlike government, they are triggered by inflectional rather than lexical features of the head, and appear on more than one constituent; like government, but unlike agreement, the semantic categories on head and dependent are not isomorphic. Other types of inflection, though unusual in the categories involved, the possibility of recursion, and their effects on the host's word class, are close to prototypical in terms of how they fare in Corbett's proposed tests for canonical agreement.
The Role of the Banking System in the International Transmission of Shocks
Authors: Sbracia Massimo , Zaghini Andrea 
Published: July 2003

AbstractThe paper analyzes the role of the banking system in the international transmission of financial shocks. A channel of transmission is defined as a mechanism through which a financial crisis in one country induces a financial crisis in another country. Channels involving banks operate through changes in the capital adequacy ratios of a common lender and in the value of collateral of domestic borrowers, through bank runs and bank panics, and through moral hazard. Recent empirical evidence points to the significant effects of the common lender channel on the probability of a financial crisis, while mitigating the role of bank runs and remaining inconclusive about moral hazard. Thus, we introduce a series of indices of vulnerability to the common lender channel that improve existing measures by taking into account both the borrower's dependence on foreign loans and the lender's exposure to a single country. By comparing the degree of vulnerability to the common lender channel during the 1990s major crises, we find that vulnerability was higher in the Asia Pacific region in 1997 (and, especially, in the five countries most involved in the crisis) than in Latin America and East Europe. Vulnerability was significantly lower in 2000 for almost all the countries in our sample, due to both a more even distribution of liabilities on the part of developing countries and a higher degree of diversification of bank investments from the three main lending countries (United States, Japan, Germany).
Archaeology Unfolding: Diversity and the Loss of Isolation
Authors: Hicks Dan 
Published: July 2003

Summary. British historical archaeology has seen new theoretical engagement in recent years. A diverse and distinctive body of theory has developed in this increasingly vibrant and international area of study, testing disciplinary boundaries, especially with history, social anthropology and material culture studies.This paper takes stock of three distinct processes within the new historical archaeology: the birth of material history, the loss of antiquity, and the loss of isolation. The implications of these processes for the wider discipline are explored with reference to landscape archaeology, using the example of the Ironbridge Gorge, Shropshire. In a consideration of future directions, it is argued that historical archaeology provides particular insights to the need across the discipline for archaeology to respond with self‐confidence to complexity by drawing out and celebrating diversity in theory and practice.
Lost and Found: the Woman Writer in the Eighteenth Century
Authors: Clarke Norma 
Published: July 2003

Jennifer Summit, Lost Property: the Woman Writer and English Literary History, 1380–1589Jane Spencer, Aphra Behn's AfterlifeHarriet Guest, Small Change: Women, Learning, Patriotism, 1750’1810Elizabeth Eger, Charlotte Grant, Cliona O Gallchoir and Penny Warburton (eds), Women, Writing and the Public Sphere, 1700’1830