A cross-sectional study provides an instantaneous picture of the relationship between the disease or condition of interest and physical activity levels at one point in time.

PROS:

�Quick

�Easy

�Cheap

CONS:

�An association does not prove causality. Therefore, with this study design, we cannot get information about whether physical inactivity caused the disease or the disease caused the physical inactivity.

�It is not possible to assess what effect changing the level of physical activity participation would have on the disease or condition of interest.

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