Correction: Measuring Physical Activity with Hip Accelerometry among U.S. Older Adults: How Many Days Are Enough?

[This corrects the article DOI: 10.1371/journal.pone.0170082.].

There is an error in the second sentence of the fourth paragraph of the Materials and Methods section under the subheading “Statistical Analysis.” The correct sentence is: We examined the within-participant correlation and agreement between the 2- or 3-day and the 7-day average CPM using Lin’s concordance correlation coefficient [16, 17] and Bland-Altman plots (average CPM only).

There are errors in the caption for Fig 4. Please see the complete, correct Fig 4 caption here.

Fig 4

Lin’s concordance correlation coefficients between 2-day (A) and 3-day (B) average counts per minute versus 7-day average counts per minute among adults aged 65 and older in National Health and Nutrition Examination Survey 2003±4 and 2005±6 accelerometry sub-study.

There are errors in the caption for S2 Fig. Please see the complete, correct S2 Fig caption here.

Lin's concordance correlation coefficients between 2-day (A) and 3-day (B) average percent of time spent in sedentary, light-lifestyle, and moderate-vigorous activity per daily versus 7-day estimate among adults aged 65 and older in National Health and Nutrition Examination Survey 2003±4 and 2005±6 accelerometry sub-study.

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