Table 4. Statistics for Multilevel Model Predicting Hourly Oxytocin Dosage by Body Mass Index (BMI) Grouping, Hours of Oxytocin Infusion, Cervical Dilation at Infusion Onset, and Neonatal Birthweight.

Variable	Multilevel Model
Hourly oxytocin dose (intercept): Average hourly dose of oxytocin infused for labor augmentation across all maternal BMI groups	182.66 mU
Group predictor (Level 2) of hourly oxytocin dose
BMI grouping (ICC)a: Percent of variance in hourly oxytocin doses explained by maternal delivery BMI group when controlling for hour of infusion, cervical dilation at infusion onset, and neonatal birthweight	16.56% 95% CI [13.7–20.04]
Individual-level predictors (Level 1) of hourly oxytocin dose
Hour of oxytocin infusion (beta coefficient): Average change in hourly oxytocin dose with each additional hour of infusion	−12.79 mU
Cervical dilation at start of oxytocin (beta coefficient): Average change in hourly oxytocin dose with each 1 cm increase in maternal cervical dilation at onset of oxytocin infusion	−20.17 mU
Neonatal birthweight (beta coefficient): Average change in hourly oxytocin dose with each increase of 1 kg in neonatal birthweight	53 mU

^aInterclass correlation coefficient (ICC) calculation for percent of variance in hourly oxytocin dose explained by maternal BMI grouping: BMI group variance/Residual + BMI group variance + Hour group variance = 6216.10/(31299.23 + 6216.10 + 10.66) = 0.1656 = 16.56% of variance in hourly oxytocin dose explained by maternal delivery BMI.