Table 3.

Relationships between occupational heat stress and physiological strain experienced by people who work in the heat.

		Air temperature	Relative humidity	Wind speed	Solar radiation
Core body temperature	r	−0.034	0.027	0.035	0.032
	p	0.034	0.087	0.031	0.102
	n	3871	3880	3871	2643
Mean body temperature	r	0.527	−0.268	0.019	0.107
	p	<0.001	<0.001	0.258	<0.001
	n	3483	3492	3482	2267
Mean skin temperature	r	0.574	−0.325	0.071	0.173
	p	<0.001	<0.001	<0.001	<0.001
	n	5630	5639	5632	3770
Heart rate	r	−0.137	0.101	0.034	0.168
	p	<0.001	<0.001	0.017	<0.001
	n	4832	4832	4838	3635
Urine specific gravity	r	−0.127	0.098	−0.004	0.120
	p	0.003	0.025	0.927	0.013
	n	527	528	526	423
Urine color	r	−0.179	0.191	−0.185	0.024
	p	<0.001	<0.001	<0.001	0.631
	n	480	480	480	393