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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 …