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Logo of brjsmedBritish Journal of Sports MedicineCurrent TOCInstructions for authors
Br J Sports Med. May 2005; 39(5): 294–297.
PMCID: PMC1725203

Reliability and validity of a brief physical activity assessment for use by family doctors


Objective: To evaluate the reliability and validity of a brief physical activity assessment tool suitable for doctors to use to identify inactive patients in the primary care setting.

Methods: Volunteer family doctors (n = 8) screened consenting patients (n = 75) for physical activity participation using a brief physical activity assessment tool. Inter-rater reliability was assessed within one week (n = 71). Validity was assessed against an objective physical activity monitor (computer science and applications accelerometer; n = 42).

Results: The brief physical activity assessment tool produced repeatable estimates of "sufficient total physical activity", correctly classifying over 76% of cases (κ 0.53, 95% confidence interval (CI) 0.33 to 0.72). The validity coefficient was reasonable (κ 0.40, 95% CI 0.12 to 0.69), with good percentage agreement (71%).

Conclusions: The brief physical activity assessment tool is a reliable instrument, with validity similar to that of more detailed self report measures of physical activity. It is a tool that can be used efficiently in routine primary healthcare services to identify insufficiently active patients who may need physical activity advice.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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