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ERIC Number: EJ967138
Record Type: Journal
Publication Date: 2011-Sep
Pages: 10
Abstractor: As Provided
Reference Count: 39
ISSN: ISSN-0270-1367
Differential Item Functioning Analysis of the 2003-04 NHANES Physical Activity Questionnaire
Gao, Yong; Zhu, Weimo
Research Quarterly for Exercise and Sport, v82 n3 p381-390 Sep 2011
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] greater than $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 [less than or equal to] $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. (Contains 4 tables.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A