Table 4. Pearson's correlation coefficient between the heat stress indices and physiological parameters .
| Variables |
Oral
Temperature (°C) |
Skin
temperature (°C) |
Ear carotid artery
temperature (°C) |
Heart rate
(beats/min) |
Systolic blood
pressure (mmHg) |
Diastolic blood
pressure (mmHg) |
| Wet-bulb globe temperature (WBGT) (°C) | ||||||
| r | 0.203 | 0.319 | 0.490 | 0.124 | 0.053 | 0.091 |
| P value | 0.006 | 0.001 | 0.001 | 0.097 | 0.470 | 0.220 |
| Predicted heat strain (PHS) (g/h) | ||||||
| r | 0.270 | 0.369 | 0.487 | 0.127 | 0.070 | 0.090 |
| P value | 0.001 | 0.001 | 0.001 | 0.080 | 0.340 | 0.208 |
| Heat stress index (HSI) (%) | ||||||
| r | 0.267 | 0.388 | 0.539 | 0.149 | 0.073 | 0.091 |
| P value | 0.001 | 0.001 | 0.001 | 0.001 | 0.330 | 0.223 |
| Discomfort index (DI) (°C) | ||||||
| r | 0.156 | 0.305 | 0.443 | 0.126 | 0.065 | 0.089 |
| P value | 0.034 | 0.001 | 0.001 | 0.091 | 0.380 | 0.230 |
| Corrected effective temperature (CET) (°C) | ||||||
| r | 0.239 | 0.094 | 0.155 | 0.024 | 0.052 | 0.120 |
| P value | 0.001 | 0.206 | 0.035 | 0.743 | 0.480 | 0.106 |
| Effective temperature (ET) (°C) | ||||||
| r | 0.317 | 0.115 | -0.062 | 0.103 | 0.065 | 0.107 |
| P value | 0.001 | 0.118 | 0.403 | 0.164 | 0.384 | 0.151 |