Table 4 Coefficient estimation of the respiratory metabolic index prediction model equation.

Response	Factor	Coefficient estimation	P value	Standard error	95% C.I
Response	Factor	Coefficient estimation	P value	Standard error	Low	High
LDH	Intercept	306.540	–	8.150	288.610	324.470
	T	32.760	0.0009	7.250	16.810	48.710
	S	−52.120	< 0.0001	7.250	−68.070	−36.170
	T*S	40.420	0.0023	10.250	17.860	62.990
	T²	98.420	< 0.0001	9.980	76.460	120.380
	S²	78.150	< 0.0001	9.980	56.200	100.110
NKA	Intercept	2.000	–	0.080	1.820	2.170
	T	−1.200	< 0.0001	0.071	−1.360	−1.050
	S	−0.310	0.0010	0.071	−0.470	−0.160
	T*S	0.470	0.0007	0.100	0.250	0.690
	T²	−0.027	0.7855	0.097	−0.240	0.190
	S²	0.480	0.0004	0.097	0.270	0.690
AKP	Intercept	228.030	–	9.140	207.920	248.150
	T	15.150	0.0893	8.130	−2.750	33.050
	S	−74.330	< 0.0001	8.130	−92.220	−56.430
	T*S	−44.560	0.0026	11.500	−69.870	−19.250
	T²	81.000	< 0.0001	11.190	56.360	105.630
	S²	22.760	0.0668	11.190	−1.870	47.400
GPX	Intercept	0.490	–	0.030	0.430	0.560
	T	−0.280	< 0.0001	0.027	−0.340	−0.220
	S	0.140	0.0003	0.027	0.080	0.200
	T*S	0.017	0.6555	0.038	−0.066	0.100
	T²	0.130	0.0049	0.037	0.048	0.210
	S²	0.280	< 0.0001	0.037	0.200	0.360
SOD	Intercept	0.520	–	0.059	0.400	0.650
	T	−0.360	< 0.0001	0.052	−0.470	−0.240
	S	−0.110	0.0638	0.052	−0.220	7.328E-003
	T*S	0.530	< 0.0001	0.074	0.370	0.700
	T²	0.440	< 0.0001	0.072	0.280	0.600
	S²	0.120	0.1158	0.072	−0.035	0.280

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