Differential Item Functioning Analysis of the 2003�04 NHANES Physical Activity Questionnaire

• Autores: Yong Gao, Weimo Zhu
• Localización: Research quarterly for exercise and sport, ISSN 0270-1367, Vol. 82, Nº. 3, 2011, págs. 381-390
• Idioma: inglés
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• Dialnet Métricas: 1 Cita
• Resumen

  • Using differential item functioning (DIF) analyses, this study examined whether there were any DIF items in the National Health and Nutrition Examination Survey (NHANES) physical activity (PA) questionnaire. A subset of adult data from the 2003�04 NHANES study (n = 3,083) was used. PA items related to respondents� occupational, transportation, domestic, leisure-time, strength-related, and sedentary activities were analyzed for DIF using Mantel-Haenszel, SIBTEST, and analysis of variance procedures. Some items were identified as DIF items, with the majority of those items favoring advantaged social groups. For example, items about domestic activity and moderate-intensity leisure-time activity were DIF items favoring non-Hispanic Whites, and persons with higher levels of education (e.g., some college or more) or income (e.g., annual family income [AFI] > $34,999). The vigorous activity item was a DIF item favoring younger adults (ages 20�59 years) and persons with higher levels of education or income. Occupational PA presented DIF favoring Hispanics and persons with lower levels of education (e.g., high school or less), and the transportation-related PA item presented DIF favoring persons with lower incomes (e.g., AFI < $34,999). These findings highlight the importance of conducting DIF analysis in PA survey construction and emphasize the need to introduce DIF concepts and methods to PA researchers.