| Variable |
Hyponatremia Status
|
p-value2 | |
|---|---|---|---|
| 0 N = 4261 |
1 N = 621 |
||
| Sex | <0.001 | ||
| Male | 297 (70%) | 25 (40%) | |
| Female | 129 (30%) | 37 (60%) | |
| Previous Marathons | 9.0 ± 11.9 | 7.7 ± 13.9 | 0.5 |
| Unknown | 3 | 0 | |
| Age (years) | 39.0 ± 9.4 | 38.1 ± 9.5 | 0.5 |
| Unknown | 2 | 0 | |
| NSAID Use | 222 (53%) | 37 (61%) | 0.3 |
| Unknown | 10 | 1 | |
| Water Loading | 304 (73%) | 50 (82%) | 0.2 |
| Unknown | 11 | 1 | |
| Pre-Race Weight (kg) | 69.7 ± 10.9 | 66.4 ± 14.5 | 0.10 |
| Unknown | 17 | 2 | |
| Pre-Race Height (m) | 1.7 ± 0.1 | 1.7 ± 0.1 | 0.007 |
| Unknown | 18 | 0 | |
| Frequent Voiding | 0.011 | ||
| <3 times | 402 (95%) | 51 (86%) | |
| ≥3 times | 19 (4.5%) | 8 (14%) | |
| Unknown | 5 | 3 | |
| Fluid Frequency | <0.001 | ||
| Every mile | 230 (54%) | 46 (75%) | |
| Every other mile | 153 (36%) | 15 (25%) | |
| Every third mile | 40 (9.5%) | 0 (0%) | |
| Unknown | 3 | 1 | |
| Post-Race Weight (kg) | 68.7 ± 10.8 | 67.8 ± 14.4 | 0.6 |
| Unknown | 15 | 5 | |
| Weight Change (kg) | -0.9 ± 1.5 | 0.7 ± 1.4 | <0.001 |
| Unknown | 28 | 5 | |
| Race Time (min) | 221.7 ± 39.4 | 252.2 ± 47.1 | <0.001 |
| Unknown | 9 | 2 | |
| Training Pace (sec/mile) | 482.2 ± 61.2 | 531.6 ± 71.5 | <0.001 |
| Unknown | 54 | 5 | |
| BMI (kg/m²) | 23.0 ± 2.5 | 22.8 ± 3.7 | 0.7 |
| Unknown | 21 | 2 | |
| 1 n (%); Mean ± SD | |||
| 2 Fisher’s exact test; Welch Two Sample t-test | |||