Table 1.

Comparison of factors influencing unplanned reintubation.

Factors	Control group (n = 113)	Observation group (n = 87)	t/χ2	P
Gender			0.143	.512
Male	55	42
Female	58	45
Age (yr)			4.122	.002
<60	60	45
≥60	53	42
ASA classification			0.196	.421
I	30	22
II	45	35
III	38	30
Education level			0.252	.512
Primary school and below	25	18
Secondary school	50	40
College degree and above	38	29
Marital status			0.324	.573
Unmarried	15	10
Married	90	70
Other	8	7
History of hypertension			0.971	.611
Yes	40	35
No	73	52
History of diabetes			0.361	.519
Yes	18	15
No	95	72
Cognitive dysfunction			5.619	.001
Yes	10	20
No	103	67
Preoperative anxiety			1.47	.126
Yes	45	50
No	68	37
Anesthesia method			0.127	.231
Pure inhalation	50	40
Intravenous combination	63	47
Indwelling catheter			0.412	.364
Yes	80	65
No	33	22
Endotracheal intubation stimulation			0.179	.136
Yes	60	55
No	53	32
Propofol dosage	1.8 mg	2.7 mg	4.621	.001
Operation time			5.127	<.001
<2 h	45	35
>2 h	68	52
Infusion volume			8.125	<.001
<2 L	50	40
>2 L	63	47
Postoperative analgesia			0.264	.212
Yes	70	55
No	43	32
Hypoxemia			0.513	.412
Yes	20	30
No	93	57

ASA = American Society of Anesthesiologists.