Efficacy and safety of propofol target-controlled infusion combined with butorphanol for sedated colonoscopy

Table 1 Demographic and clinical characteristics of patients in the different groups

Groups	n	Age (yr)	Gender (M/F)	BMI (kg/m2)	ASA (I/II)	Operation time (min)
Group C	38	55.9 ± 4.3	18/20	21.8 ± 1.4	26/12	12 (10-14)
Group B1	36	56.9 ± 4.2	17/19	21.3 ± 1.4	24/12	11 (10-12)
Group B2	32	56.6 ± 4.8	15/17	21.2 ± 1.3	21/11	11 (10-12)
P value		0.591	0.999	0.200	0.969	0.218

M: Male; F: Female; BMI: Body mass index; ASA: American Society of Anesthesiologists Physical Status Classification.