Table 5. Pearson's correlation coefficient among the heat stress indices .

Variables	Wet-bulb globe temperature (°C)	Predicted heat strain (g/h)	Heat stress index (%)	Discomfort index (°C)	Effective temperature (°C)	Corrected effective temperature (°C)
Wet-bulb globe temperature (°C)
r	1.000	0.930	0.930	0.981	0.860	0.529
P value	0.001	0.001	0.001	0.001	0.001	0.001
Predicted heat strain (g/h)
r	0.930	1.000	0.906	0.899	0.723	0.533
P value	0.001	0.001	0.001	0.001	0.001	0.001
Heat stress index (%)
r	0.930	0.906	1.000	0.892	0.767	0.529
P value	0.001	0.001	0.001	0.001	0.001	0.001
Discomfort index (°C)
r	0.981	0.899	0.892	1.000	0.894	0.659
P value	0.001	0.001	0.001	0.001	0.001	0.001
Effective temperature (°C)
r	0.860	0.723	0.767	0.894	1.000	0.875
P value	0.001	0.001	0.001	0.001	0.001	0.001
Corrected effective temperature (°C)
r	0.646	0.533	0.529	0.659	0.875	1.000
P value	0.001	0.001	0.001	0.001	0.001	0.001