Table 2. Comparison of wake-up times between the 2 groups ($\overline{x}\pm s$).

Group	Recovery of spontaneous breathing (min)	Full wakefulness (min)	Removal of the tracheal tube (d)
Observation group (n=58)	5.80±1.41	15.60±3.54	3.14±0.10
Control group (n=57)	13.75±3.12	26.27±5.18	4.03±0.25
t	17.658	12.916	25.144
P	<0.001	<0.001	<0.001

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