Table 3.

Correlation coefficient and standard error of selected independent variables and duration to first flatus.

Screened Variables	Correlation coefficients (β)	Standard error	p value
Age	0.243	0.078	0.003
Gender	−3.718	1.411	0.011
BMI	−0.913	0.258	0.001
Surgical duration	−0.017	0.018	0.339
Operative segments	−4.079	1.815	0.028
Overall consumption of sufentanil	0.426	0.075	0.000

BMI, body mass index.