1. Accuracy of the Fitbit Zip for Measuring Steps for Adolescents With Visual Impairments.
- Author
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Haegele, Justin A., Brian, Ali S., and Wolf, Donna
- Subjects
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ACCELEROMETERS , *CONFIDENCE intervals , *DIAGNOSIS , *GAIT in humans , *RESEARCH methodology , *STAFFS (Sticks, canes, etc.) , *T-test (Statistics) , *VISION disorders , *JUDGMENT sampling , *EFFECT sizes (Statistics) , *MEDICAL equipment reliability , *DESCRIPTIVE statistics , *INTRACLASS correlation , *ADOLESCENCE ,RESEARCH evaluation - Abstract
Our purpose in this study was to document the criterion validity of the Fitbit Zip for measuring steps taken by youth with visual impairments (VI). A secondary purpose was to determine whether walking pace, mounting position, or relative position to the user's mobility device impacted the criterion validity of the device. Fourteen adolescent-aged individuals (Mage = 15.4; 13 male and 1 female) with VI participated in this study. Participants wore four Fitbit Zips at different mounting positions and completed two, 2-min walking trials while the lead investigator hand tallied steps. Measurement validity was analyzed using absolute percent error (APE), intraclass correlation coefficients estimated level of conformity, and paired samples t tests and Cohen's d effect sizes assessed APE relative to mounting positions. Results supported the use of the Fitbit Zip during regular-paced walking; however, caution must be used during activities exceeding regular walking speeds, as devices consistently underestimated steps. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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