Results of logistic regression for hospitalisation outcome according to traditional susceptibility factors for exertional heat illness (EHI) among 361 personnel over 88 months of reporting
| Susceptibility variable | OR (95% CI) | p Value* | OR (95% CI)§ | p Value*§ |
|---|---|---|---|---|
| Senior ranks and officers | 1 [Reference] | – | 1 [Reference] | – |
| Junior ranks | 1.12 (0.57 to 2.20) | 0.735 | 0.97 (0.44 to 2.15) | 0.939 |
| Recruits | 0.73 (0.36 to 1.49) | 0.392 | 0.42 (0.18 to 0.99) | 0.047 |
| Age <30 years | 1 [Reference] | – | 1 [Reference] | – |
| Age >30 years | 0.74 (0.40 to 1.37) | 0.331 | 0.60 (0.29 to 1.23) | 0.164 |
| Temperate climate, non-summer months | 1 [Reference] | – | 1 [Reference] | – |
| Temperate climate, summer months§ | 1.04 (0.62 to 1.76) | 0.872 | 1.09 (0.62 to 1.91) | 0.752 |
| Hot climate§ | 0.96 (0.56 to 1.62) | 0.870 | 1.38 (0.67 to 2.80) | 0.381 |
| Self-paced | 1 [Reference] | – | 1 [Reference] | – |
| Group-paced | 1.67 (1.02 to 2.75) | 0.042 | 1.66 (0.86 to 3.17) | 0.128 |
| Vented clothing | 1 [Reference] | – | 1 [Reference] | – |
| Occlusive clothing | 0.60 (0.39 to 0.92) | 0.020 | 0.56 (0.34 to 0.93) | 0.025 |
| Physically fit | 1 [Reference] | – | 1 [Reference] | – |
| Lack of documented fitness | 0.92 (0.39 to 2.20) | 0.859 | 0.93 (0.30 to 2.38) | 0.879 |
| Acclimatised to heat | 1 [Reference] | – | 1 [Reference] | – |
| Unacclimatised | 0.38 (0.20 to 0.72) | 0.003 | 0.31 (0.15 to 0.66) | 0.002 |
| Euhydated/overhydrated | 1 [Reference] | – | 1 [Reference] | – |
| Dehydrated | 0.93 (0.57 to 1.50) | 0.755 | 1.47 (0.76 to 2.82) | 0.249 |
| No history of EHI | 1 [Reference] | – | 1 [Reference] | – |
| Previous EHI | 0.68 (0.33 to 1.43) | 0.311 | 0.72 (0.33 to 1.58) | 0.412 |
| Rested adequately | 1 [Reference] | – | 1 [Reference] | – |
| Sleep deprived | 0.61 (0.33 to 1.14) | 0.115 | 0.76 (0.37 to 1.56) | 0.454 |
| No identifiable illness | 1 [Reference] | – | 1 [Reference] | – |
| Febrile or infectious (intercurrent) illness | 0.66 (0.38 to 1.12) | 0.123 | 0.52 (0.26 to 1.05) | 0.068 |
*Calculated using the Wald test.
§Adjusted for occupational seniority, age, prevailing climate, pacing of activity, clothing ensemble worn, physical fitness level, heat acclimatisation status, hydration state, history of EHI, sleep balance and presence/absence of intercurrent illness.