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

BMC Public Health

Table 2 Correlation matrix of the variables

Variable	1	2	3	4	5	6	7	8	9	10	11
Age	–
Body mass index	0.242^**	–
Maximum aerobic capacity	−0.515^**	−0.497^**	–
Body surface area	0.060	0.817^**	−0.327^**	–
Dry temperature	−0.019	0.093	−0.211^**	0.049	–
Wet temperature	0.010	−.027	−0.172^*	−0.065	0.626^**	–
Globe temperature	0.009	0.082	−0.151^*	0.056	0.907^**	0.511^**	–
Wind speed	0.014	0.051	−0.107	0.068	0.296^**	0.152^*	0.347^**	–
Total metabolism	−0.026	0.060	−0.085	0.004	0.318^**	0.131	0.332^**	0.082	–
Clothing thermal insulation	−0.102	0.017	−0.036	0.048	0.454^**	0.054	0.530^**	0.135	0.321^**	–
Tympanic temperature	0.139^*	0.177^*	0.350^**	0.101	0.751^**	0.685^**	0.766^**	0.258^**	0.509^**	0.388^**	–

(1) Age, (2) body mass index, (3) maximum aerobic capacity, (4) body surface area, (5) dry temperature, (6) wet temperature, (7) globe temperature, (8) wind speed, (9) total metabolism, (10) clothing thermal insulation, (11) Tympanic temperature.
^**P < 0.01
^*P < 0.05

ISSN: 1471-2458