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. 2025 Nov 26;25:4332. doi: 10.1186/s12889-025-25655-z

Table 8.

The kappa coefficient between the studied indices and physiological parameters in different Climatic conditions

Index	Heat strain indices	Warm and dry environment			Warm and humid environment			All environment
Index	Heat strain indices	Convective (N = 45)	Radiative (N = 65)	Both (N = 110)	Convective (N = 41)	Radiative (N = 49)	Both (N = 90)	All environment
EHSRA	Tympanic temperature	0.403^*	0.506^**	0.591^**	0.661^**	0.336^**	0.544^**	0.588^**
EHSRA	Heart rate	0.069	0.442^**	0.445^**	0.338^**	0.224^*	0.351^**	0.421^**
PHSRA	Tympanic temperature	0.403^*	0.552^**	0.623^**	0.686^**	0.367^**	0.572^**	0.615^**
PHSRA	Heart rate	0.013	0.402^**	0.435^**	0.315^*	0.228^*	0.350^**	0.414^**
OPHSRA	Tympanic temperature	0.403^*	0.520^**	0.596^**	0.526^**	0.185^*	0.438^**	0.536^**
OPHSRA	Heart rate	0.069	0.427^**	0.434^**	0.337^**	0.085	0.307^**	0.390^**
WBGT	Tympanic temperature	0.297^*	0.438^**	0.523^**	0.412^**	0.000	0.250^**	0.427^**
WBGT	Heart rate	0.060	0.296^**	0.335^**	0.158	0.000	0.129^*	0.269^**
PHS	Tympanic temperature	387**	412**	0.463^**	384^**	277^**	0.422^**	0.470^**
PHS	Heart rate	157^**	289^**	0.323^**	0.187^*	0.114^*	214^**	0.297^**

^*P < 0.05

^**p < 0.01