Reliability and validity of the international physical activity questionnaire in the Nord-Trøndelag health study (HUNT) population of men.

BMC Med Res Methodol · 2008 · PMC2577099 · PMID 18844976

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a clear trendno p-value reported

When VO 2max data were categorized into 2 or 3 groups, there was a clear trend showing a higher activity levels with increased fitness level.

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