Table 2.

Stress index changes at different time points ($\overline{x}\pm s$, n = 50).

Group	Cor (μg/L)		A (μg/L)		NA (μg/L)
	T1	T2	T1	T2	T1	T2
Single-drug group	223.34 ± 21.69	313.32 ± 25.43	81.34 ± 13.67	139.32 ± 21.23	343.24 ± 24.69	513.52 ± 29.43
Composite group	219.24 ± 21.58	277.34 ± 28.77	79.24 ± 14.78	117.23 ± 22.54	339.84 ± 25.21	447.24 ± 27.37
t	0.948	6.626	0.738	5.045	0.681	11.661
P	0.346	<0.001	0.463	<0.001	0.497	<0.001