Association between operative position and postoperative nausea and vomiting in patients undergoing laparoscopic sleeve gastrectomy

Table 1 Demographical characteristics data of the patients

Variable	The supine position group	The supine split-leg position group	P value
Age (year)	32.27 ± 7.00	30.40 ± 6.04	0.273
BMI (kg/m2)	39.88 ± 5.48	39.90 ± 4.83	0.986
Gender (female), n (%)	24 (80)	28 (93)	0.490
Smoking	12	2	0.002a
Systolic pressure (mmHg)	141.1 ± 16.90	131.77 ± 17.11	0.038a
Diastolic pressure (mmHg)	93.77 ± 13.18	88.93 ± 12.20	0.146
Blood uric acid (μmol/L)	402.00 (376.00, 485.25)	409.50 (343.25, 464.00)	0.124
Fasting blood-glucose (mmol/L)	5.44 (4.80, 6.96)	5.04 (4.59, 5.62)	0.311
ALT (U/L)	42.50 (18.25, 82.25)	27.00 (17.00, 44.75)	0.149
AST (U/L)	27.00 (18.50, 47.50)	21.00 (17.00, 30.25)	0.120

^aP < 0.05.

Normal distribution was expressed as the mean ± SD, non-normal distribution is expressed as median (interquartile spacing). The percentage (95% confidence interval) was for categorical variables. BMI: Body mass index; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase.