Table 4.

Multivariate logistic regression analysis for predictive factors of the incidence of CRBD (CRBD≥1) and the severity of CRBD (CRBD≥2)

	CRBD≥1(incidence)			CRBD≥2(severity)
	Odd ratio	95% CI	P	Odd ratio	95% CI	P
Age	3.203	[1.6, 6.6]	0.002	2.106	[1.2, 3.8]	0.013
≥ 50 y
<50 y
Sufentanil dosage	1.475	[0.9, 2.4]	0.111	1.416	[0.9, 2.2]	0.133
>20μg
≤ 20μg
Surgery duration time	0.783	[0.4, 1.4]	0.403	0.655	[0.4, 1.2]	0.141
>180 min
≤ 180 min
Type of surgery:	2.297	[0.7, 7.2]	0.153	1.898	[0.8, 4.4]	0.132
Laparoscopic surgery
Open abdominal surgery
Cervical conization and pelvic surgery
Type of laparoscopic surgery:	1.899	[1.1, 3.2]	0.017	1.863	[1.1, 3.1]	0.019
Uterus-related surgery
Non-uterine related surgery
Occasion of catheterization:	0.633	[0.4, 1.1]	0.125	0.614	[0.3, 1.1]	0.109
Before anaesthesia
After anaesthesia
Additional analgesics:	0.509	[0.2, 1.1]	0.072	0.408	[0.2, 0.9]	0.032
Yes
No
Intraoperative atropine:	1.414	[0.9, 2.3]	0.152	1.370	[0.9, 2.2]	0.172
Yes
No
Postoperative neostigmine and atropine:	0.767	[0.9, 2.3]	1.098	1.347	[0.7, 2.5]	0.331
Yes
No
Postoperative pain:	1.742	[1.0, 3.2]	0.066	1.517	[0.9, 2.6]	0.133
VAS ≥ 4
VAS ≤ 3