Direct and indirect measurement of physical activity in older adults: a systematic review of the literature.

Int J Behav Nutr Phys Act · 2012 · PMC3549726 · PMID 23245612

Europe PMC DOI

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a clear trendno p-value reported

While a clear trend regarding the agreement for mean differences between other PA measures (i.e., direct with indirect, indirect with indirect) did not emerge, there were only a limited number of studies that reported comparable units.

also in 19,460 other papers

Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.