Table 3. Multivariable Linear Regression Analysis for Accumulated Milligram Morphine Equivalents During Days 0 to 5 After Major Colorectal Surgery in 842 Patients, After Backward Selection of Covariates^a .

Factor	Coefficient (SE)	t Ratio	P value
Individualized opioid regimen (yes vs no)	−11.57 (3.83)	−3.02	.003
Gabapentin (yes vs no)	−39.14 (4.52)	−8.66	<.001
Clonidine (yes vs no)	11.63 (3.61)	3.23	.001
Age, y	−1.02 (0.11)	−9.62	<.001

^{^a}

There were 842 observations (F_{5, 836} = 57.49; P < .001).

Table 3. Multivariable Linear Regression Analysis for Accumulated Milligram Morphine Equivalents During Days 0 to 5 After Major Colorectal Surgery in 842 Patients, After Backward Selection of Covariatesa .