What Was the Goal of the Analysis?

Analytic goals for studies can be viewed as either seeking evidence of causality or prediction. We were confused by the goal of the article, “Impact of Gait Speed on the Obesity Paradox in Older Patients With Cardiovascular Disease.”1Nakamura T Kamiya K Matsunaga A et al.Impact of gait speed on the obesity paradox in older patients with cardiovascular disease.Am J Med. 2019; 132 (e1): 1458-1465https://doi.org/10.1016/j.amjmed.2019.06.047Abstract...