Error in Figure Caption

In the Original Investigation titled “Assessment of Bidirectional Relationships Between Physical Activity and Depression Among Adults: A 2-Sample Mendelian Randomization Study,”¹ published on January 23, 2019, there was an error in the caption of Figure 1. B₂, which indicates the causal relationship of interest to be estimated, is found by dividing B₃ by B₁. This article has been corrected online.