Table 4. Comparison of hemodynamic indicators between the 2 groups ($\overline{x}\pm s$).

Indicator	Group	T0	T1	T2	T3
HR (bates/min)	Observation group (n=58)	74.42±8.15	73.65±7.49	75.56±9.41	74.62±8.20
	Control group (n=57)	74.50±8.19	82.19±11.27	86.07±13.22	81.87±11.45
	t	0.053	4.794	4.918	3.909
	P	0.958	<0.001	<0.001	<0.001
MAP (mmHg)	Observation group (n=58)	94.16±10.52	94.80±11.12	95.24±11.77	96.72±13.50
	Control group (n=57)	94.21±10.55	97.51±12.43	105.42±14.47	109.22±16.10
	t	0.024	2.142	4.069	4.515
	P	0.981	0.034	<0.001	<0.001

P value, probability; t-test, Student’s t-test.