Development of a personal heat strain risk assessment (PHSRA) index in workplaces and its validation

BMC Public Health

Table 3 Effect coefficients of the variables in producing thermal strain

Variable		Direct effect	Indirect effect	P value
Personal factors	Age	0.226	0.031	P < 0.001
	Body mass index	1.057	0.145	P < 0.001
	Maximum aerobic capacity	−0.466	− 0.064	P < 0.001
	Body surface area	0.775	0.106	P < 0.001
	Thermal strain	0.137	–	P < 0.001
Main factors	Dry temperature	0.936	0.739	P < 0.001
	Wet temperature	0.872	0.688	P < 0.001
	Globe temperature	0.969	0.765	P < 0.001
	Wind speed	0.311	0.245	P < 0.001
	Total metabolism	0.611	0.482	P < 0.001
	Clothing thermal insulation	0.485	0.383	P < 0.001
	Thermal strain	0.789	–	P < 0.001

ISSN: 1471-2458