Table 1.
Population characteristics by EHS status
| EHS (n = 744) | No EHS (n = 3,720) | |
|---|---|---|
| Means ± SD or n (%) | Means ± SD or n (%) | |
| BSA, m2 | 1.99 ± 0.18 | 1.99 ± 0.18 |
| BSA·mass−1, m2/kg | 0.0244 ± 0.002 | 0.0243 ± 0.005 |
| Body mass, kg | 82.53 ± 12.46 | 82.48 ± 13.20 |
| BMI, kg/m2 | 26.51 ± 3.10 | 26.44 ± 3.55 |
| Age, yr | 24.57 ± 5.52 | 26.08 ± 6.80 |
| Time since last weight/height measurement, days | 78.08 ± 61.91 | 86.05 ± 57.57 |
| Sex | ||
| Male | 683 (91.8) | 3388 (91.1) |
| Female | 61 (8.2) | 332 (8.9) |
| Rank | ||
| E1–E3 | 329 (44.2) | 1344 (36.2) |
| E4–E6 | 258 (34.7) | 1462 (39.3) |
| E7–E9 | 24 (3.2) | 253 (6.8) |
| O1–O3 | 121 (16.3) | 569 (15.3) |
| O4–O6 | 12 (1.6) | 90 (2.4) |
SD, standard deviation; n, number, EHS, exertional heat stroke; BSA, body surface area; BSA·mass−1, body surface area-to-mass ratio; E, enlisted soldiers at the following ranks: E1–E3 = Private to Private First Class; E4–E6 = Corporal to Staff Sergeant; E7–E9 = Sergeant First class to Command Sergeant Major; O = Officers at the following ranks: O1–O3 = Second Lieutenant to Captain, O4–O6 = Major to Colonel.