Logistic regression of study participant baseline characteristics and association of the development of acute kidney injury
| Participant characteristics | p Value | Differences OR (95% CI) |
| Age | 0.3 | 1.06 (0.57 to 1.92) |
| Body mass index (kg/m2) | 0.94 | 1.01 (0.78 to 1.32) |
| Pack weight (kg) | 0.64 | 1.09 (0.84 to 1.41) |
| Prior ultramarathons | 0.87 | 0.95 (0.85 to 1.05) |
| Prior marathons | 0.53 | 1.01 (0.97 to 1.05) |
| Non-steroidal anti-inflammatory drug use/month prior | 0.34 | 2.0 (0.06 to 73.36) |