Assessing factorial and convergent validity and reliability of a food behaviour checklist for Spanish-speaking participants in US Department of Agriculture nutrition education programmes

Objective—To assess convergent validity, factorial validity, test–retest reliability and internal consistency of a diet quality food behaviour checklist (FBC) for low-literate, low-income Spanish speakers. Design—Participants (n 90) completed three dietary recalls, the Spanish-language version of the US Department of Agriculture (USDA) Household Food Security Survey Module (HFSSM) and the Spanish-language FBC. Factor structure was examined using principal component analysis. Spearman correlation coefficients between FBC item responses and nutrient intakes from 24 h recalls were used to estimate convergent validity. Correlation coefficients were also calculated between FBC item responses at two time points in another group of participants (n 71) to examine test–retest reliability. Cronbach's α coefficient was determined for items within each sub-scale. Setting—Non-profit community agencies serving low-income clients, migrant farm worker camps and low-income housing sites in four California counties. Subjects—Spanish-speaking women (n 161) who met income eligibility for the SNAP-Ed (Supplemental Nutrition Assistance Program–Education). Results—Factor analysis resulted in six sub-scales. Responses to nineteen food behaviour items were significantly correlated with hypothesized 24 h recall data (with a maximum correlation of 0·44 for drinking milk and calcium) or the USDA HFSSM (0·42 with the food security item). Coefficients for test–retest reliability ranged from 0·35 to 0·79. Cronbach's α ranged from 0·49 for the diet quality sub-scale to 0·80 for the fruit and vegetable sub-scale. Conclusions—The twenty-two-item FBC and instruction guide will be used to evaluate USDA community nutrition education interventions with low-literate Spanish speakers. This research contributes to the body of knowledge about this at-risk population in California

Assessing Face Validity of a Physical Activity Questionnaire for Spanish-Speaking Women in California

To create a culturally appropriate assessment, the study reported here developed and evaluated the face validity of a visually enhanced Spanish-language physical activity questionnaire. A professional translated the English version of the International Physical Activity Questionnaire (IPAQ), and an expert panel subsequently reviewed it. Photos of individuals engaged in physical activity behaviors were added. Cognitive interviews were completed with low-income Spanish-speaking women in California (n=20). Questionnaire text was modified and then reviewed by translation experts (n=7). With a high readability score of 98, the questionnaire demonstrates adequate face validity and is ready for further validation

Misreporting of Dietary Intake Affects Estimated Nutrient Intakes in Low-Income Spanish-Speaking Women

Misreporting of dietary intake affects the validity of data collected and conclusions drawn in studies exploring diet and health outcomes. One consequence of misreporting is biological implausibility. Little is known regarding how accounting for biological implausibility of reported intake affects nutrient intake estimates in Hispanics, a rapidly growing demographic in the United States. Our study explores the effect of accounting for plausibility on nutrient intake estimates in a sample of Mexican-American women in northern California in 2008. Nutrient intakes are compared with Dietary Reference Intake recommendations, and intakes of Mexican-American women in a national survey are presented as a reference. Eighty-two women provided three 24-hour recalls. Reported energy intakes were classified as biologically plausible or implausible using the reported energy intakes to total energy expenditure cutoff of 1.24, with low-active physical activity levels used to estimate total energy expenditure. Differences in the means of nutrient intakes between implausible (n=36) and plausible (n=46) reporters of energy intake were examined by bivariate linear regression. Estimated energy, protein, cholesterol, dietary fiber, and vitamin E intakes were significantly higher in plausible reporters than implausible. There was a significant difference between the proportions of plausible vs implausible reporters meeting recommendations for several nutrients, with a larger proportion of plausible reporters meeting recommendations. Further research related to misreporting in Hispanic populations is warranted to explore the causes and effects of misreporting in studies measuring dietary intake, as well as actions to be taken to prevent or account for this issue

Interaction of Ketotifen Fumarate with Anhydrous Theophylline in Simulated Gastric and Intestinal Media and Effect on Protein Binding

Purpose: The purpose of the present study was to investigate interaction between ketotifen fumarate and anhydrous theophylline in aqueous media of various pH.Methods: By using Job’s continuous-variation analysis and Ardon’s spectrophotomeric methods, the values of stability constants of theophylline with ketotifen were determined at a fixed temperature (37 0C) at each of the medium pH. In vitro study of protein (bovine albumin, fraction v) binding was carried out by equilibrium dialysis method at pH 7.4 to ascertain the influence of ketotifen on the protein binding of theophylline.Results: Stability constant, ranging between 5.07 and 6.35, were derived from Ardon’s plot, indicating that complexes formed, as a result of interaction between the drugs, were comparatively stable. However, following theophylline interaction with ketotifen, stability constant was < 1 at gastric pH (0.4 and 2.0) and 4.12 at intestinal pH. (6.0)The highest degree of protein binding by ketotifen was 98 % and the lowest 90 %. For theophylline, the highest and lowest degrees of protein binding were 90 and 85 %, respectively.Conclusion: Concurrent administration of ketotifen and theophylline would result in the formation of a stable complex and this is likely to reduce the therapeutic activities of both drugs. With regard to protein binding, the concentration of theophylline increased with decrease in ketotifen concentration.Keywords: Stability constant, Job’s method, Ardon’s method, Ketotifen fumarate, Complex formation, Protein binding, Theophyllin

User-defined transfer functions to improve pointing performance in graphical user interfaces

Pointing at a target is the most fundamental and frequent task in graphical user interfaces (GUIs). Pointing devices like the mouse is the most popular and cheapest input devices for current desktop computers and the touchpad or trackpad is the best match between performance and demand of pointing devices for laptop computers. Due to the widespread and frequent use of pointing devices, even a small improvement in pointing performance can have a large effect on a system's usability. The physical movement of a mouse or dragging motion of a finger on a touchpad is translated into the movement of a pointer on the graphical display through so-called transfer functions. Transfer functions are actually the only pointing facilitation technique available to all users in modern days operating systems. Despite the importance of transfer functions, very little is known about the nature of the optimal transfer functions. Pointer acceleration (PA) is the default behavior on the Microsoft Windows and Apple macOS operating systems. It dynamically manipulates the Control-Display (CD) gain between the input device and the pointer as a function of the device's velocity. This mechanism has been implemented in modern desktop user interfaces and increases the CD gain as the user's hand or finger velocity increases. Previous work showed that the default functions of Windows, Apple macOS and Xorg (the X.Org Foundation server) have shown better performance compared to a constant CD gain. Apple macOS has the improvised performance for small target widths but reduces performance for covering the long distances. Current knowledge on velocity based transfer functions relies on evaluations of basic functions and adapting the CD gain in discrete or continuous ways using low-order polynomials. The internal details and design rationales of the transfer functions that we all use are mostly unknown. The aim of this thesis is to gain a deeper understanding of the optimal transfer functions and to assess them based on natural interaction with the system using a user-driven approach. The implementation part of the thesis is divided into two desktop applications, one is for recording all raw mouse and pointer movement as well as recording contextual information to understand a transfer function. The other implementation part of the thesis is to enable the user to define their own transfer functions. Users can customize existing default transfer functions and use them to control the pointer. These two applications are used to conduct a study that collects user device information and as well as user-defined transfer functions. Finally, we identify interesting transfer function for touchpads and mice

Acculturation, physical activity and television viewing in Hispanic women: findings from the 2005 California Women's Health Survey

Objective—To assess the relationship of acculturation with physical activity and sedentary behaviours among Hispanic women in California. Design—Data from the 2005 California Women's Health Survey (CWHS) – a cross-sectional telephonic survey of health indicators and health-related behaviours and attitudes – were used. Setting—Using a random-digit dialling process, data were collected monthly from January to December 2005. Subjects—A total of 1298 women aged ≥18 years in California who self-identified as Hispanic. Results—Of the participants included in the analysis, 49% were adherent to physical activity recommendations (with 150 min of weekly activity signifying adherence). There was no significant association between language acculturation and moderate or vigorous physical activity after controlling for potential confounders such as smoking, age and employment status. There was also no association between duration of residence in the USA and moderate or vigorous physical activity. Language acculturation was positively associated with television (TV) viewing, with highly acculturated women reporting more hours of TV viewing compared with women with an intermediate acculturation score (P=0.0001), and those with an intermediate score reporting more hours of TV viewing compared with those with a low score (P=0.003). This relationship persisted after inclusion of smoking, employment status, age and education in the model. Conclusions—Higher levels of language acculturation may be associated with increased sedentary behaviours because of the influence of US culture on those women who have assimilated to the culture. Acculturation is an important factor to be taken into account when designing health education interventions for the Hispanic female population

Validation of a collaboration readiness assessment tool for use by Supplemental Nutrition Assistance Program Education (SNAP-Ed) agencies and partners.

To evaluate content and face validity of a collaboration readiness assessment tool developed to facilitate collaborative efforts to implement policy, systems, and environment changes in Supplemental Nutrition Assistance Program–Education (SNAP-Ed).Evaluation of the validity of the tool involved 2 steps. Step 1 was conducted with 4 subject matter experts to evaluate content validity. Step 2 used an iterative cognitive testing process with 4 rounds and 16 SNAP-Ed staff and community partners to evaluate face validity.Subject matter experts found that survey items appropriately matched the content area indicated and adequately covered collective efficacy, change efficacy, and readiness. Cognitive testing with SNAP-Ed staff and partners informed modifications and resulted in adequate face validity.The ability to measure collaboration readiness will allow agencies and community partners that implement SNAP-Ed to target areas that facilitate collaboration efforts needed for policy, systems, and environment change and collective efficacy. Further cognitive testing of the tool with other populations is needed to ensure its applicability and usefulness. Evaluation of the reliability of the tool with a broad range of SNAP-Ed programs and community agencies is also recommended

Using Qualitative Methods to Improve Questionnaires for Spanish Speakers: Assessing Face Validity of a Food Behavior Checklist

Development of outcome measures relevant to health nutrition behaviors requires a rigorous process of testing and revision. Whereas researchers often report performance of quantitative data collection to assess questionnaire validity and reliability, qualitative testing procedures are often overlooked. This report outlines a procedure for assessing face validity of a Spanish-language dietary assessment tool. Reviewing the literature produced no rigorously validated Spanish-language food behavior assessment tools for the US Department of Agriculture’s food assistance and education programs. In response to this need, this study evaluated the face validity of a Spanish-language food behavior checklist adapted from a 16-item English version of a food behavior checklist shown to be valid and reliable for limited-resource English speakers. The English version was translated using rigorous methods involving initial translation by one party and creation of five possible versions. Photos were modified based on client input and new photos were taken as necessary. A sample of low-income, Spanish-speaking women completed cognitive interviews (n=20). Spanish translation experts (n=7) fluent in both languages and familiar with both cultures made minor modifications but essentially approved client preferences. The resulting checklist generated a readability score of 93, indicating low reading difficulty. The Spanish-language checklist has adequate face validity in the target population and is ready for further validation using convergent measures. At the conclusion of testing, this instrument may be used to evaluate nutrition education interventions in California. These qualitative procedures provide a framework for designing evaluation tools for low-literate audiences participating in the US Department of Agriculture food assistance and education programs