Fitting a linear model to survey data when the long-term average daily intake of a dietary component is an explanatory variable
Titelübersetzung:Verbesserung eines linearen Modells von Längsschnittdaten zur Nahrungsmittelaufnahme von diätetischen Komponenten als erklärende Variable von Gesundheit
Autor/in:
Kott, Phillip S.; Guenther, Patricia M.; Wagstaff, David A.; Juan, WenYen; Kranz, Sibylle
Quelle: Survey Research Methods, 3 (2009) 3, S 157-165
Inhalt: "The National Health and Nutrition Examination Survey (NHANES) collects information on both dietary intake and health conditions from a complex sample of individuals in the US. Instrumental-variable regression can be used to model an individual's health-related attribute as a linear function of explanatory variables including the average daily intake of dietary components. This overcomes the apparent limitation of the NHANES collecting dietary intake data on only two days per sampled individual because the averages of two days per individual exhibit considerable intra-individual variability. Readily available software routines can perform survey-sensitive instrumental-variable regression with data like that collected by the NHANES, but the relevant quantitative literature is not clear about what parameters these routines are actually estimating. The authors fit the long-term (usual) serum beta-carotene level of a population of women aged 20-64 to a linear function of each woman's long-term average (usual) daily beta-carotene intake from food and other explanatory variables using survey-sensitive instrumental regression and provide two interpretations of the results." (author's abstract)
Schlagwörter:nutrition; Gesundheit; North America; regression analysis; Nahrungsmittel; ernährungsbedingte Krankheit; health consequences; nutrition-related illness; Nordamerika; remuneration for members of parliament; Lebensalter; United States of America; Verhalten; food; Lebenserwartung; behavior; Regressionsanalyse; life expectancy; Lebensmittel; Mittelwert; USA; woman; Ernährung; gesundheitliche Folgen; mean; Diäten; age; health
SSOAR Kategorie:Forschungsarten der Sozialforschung, Erhebungstechniken und Analysetechniken der Sozialwissenschaften, Gesundheitspolitik
Impact of mixed survey modes on physical activity and fruit/ vegetable consumption: a longitudinal study
Titelübersetzung:Einsatz gemischter Umfragemethoden über körperliche Aktivitäten und Obst-/ Gemüseverbrauch: eine Längsschnittuntersuchung
Autor/in:
Nigg, Claudio R.; Motl, Robert W.; Wong, Kristin T.; Yoda, Lisa U.; McCurdy, Dana K.; Paxton, Raheem; Horwath, Caroline C.; Dishman, Rod K.
Quelle: Survey Research Methods, 3 (2009) 2, S 81-90
Inhalt: "It is recommended that researchers who use mixed modal methods for data collection compare their impact on outcome measures. The purpose of this study was to examine the physical activity and fruit/ vegetable consumption behaviors of a multiethnic sample of adults, comparing participants who continued a telephone survey and those who transitioned from a telephone to a web-based survey for a follow-up data collection point. This longitudinal study used a random sample of 700 Hawaii residents (63.3% Female; Mean age=47, SD=17.1). At baseline, participants completed a computer-assisted telephone interview assessing the stage, behavior, and decisional balance of both physical activity and fruit/ vegetable consumption. For the three-month follow-up survey, participants were given the option of completing the survey either on the web or by phone. Repeated measures analysis of variance (ANOVA) was computed for related physical activity scales and fruit/ vegetable consumption variables to compare the change in response across time between a web group and phone group. For both physical activity and fruit/ vegetable consumption, all mode-by-time interactions were significant). The participants who preferred the telephone survey maintained their levels, whereas those who preferred the web survey reported a decrease in each variable. These results suggest that changing the mode of a survey may introduce a systematic bias in data and that researchers should proceed with caution when using mixed modes of data collection." (author's abstract)
Schlagwörter:US citizen; vegetarianism; online survey; Internet; North America; comparison of methods; eating behavior; Agrarprodukt; telephone interview; Verbraucher; Nordamerika; Vegetarismus; influence; consumer; Telefoninterview; United States of America; Essverhalten; Methodenvergleich; activity; sports; Online-Befragung; Sport; US-Amerikaner; USA; Einfluss; Konsumverhalten; consumption behavior; Internet; Aktivität; gender-specific factors; agricultural product
SSOAR Kategorie:Forschungsarten der Sozialforschung, Erhebungstechniken und Analysetechniken der Sozialwissenschaften