Read the entire report.
https://www.opss.org/sites/default/files/Report-of-the-DoD-DMAA-Safety-Review-Panel-2013.pdf
Page 38
Soldiers reporting DMAA use in 2011 had almost 40% lower odds of having an
adverse medical outcome (crude OR: 0.63, 95% CI: 0.47, 0.84), though this effect
diminished...