Table 3. Multivariable model compared to model excluding significantly imputed variables.

	Final model			Final model excluding imputed variables
Variable	Parameter estimate(s)	SE	P-value	Parameter estimate(s)	SE	P-value
Intercept	11.02142	5.68115	0.0525	10.68852	5.67347	0.0597
Maternal race
Asian	-0.15719	0.03980	<0.0001*	-0.16569	0.03971	<0.0001*
Black/African American	0.00283	0.02518	0.9105	0.01100	0.02500	0.6599
Multiple races	-0.09668	0.05513	0.0796	-0.08903	0.05504	0.1059
Other	-0.00151	0.02850	0.9579	0.00601	0.02837	0.8322
Unknown	-0.02251	0.04450	0.6130	-0.01811	0.04452	0.6841
Maternal first trimester BMI
Underweight	-0.10882	0.05894	0.0650	NA	NA	NA
Overweight	0.01170	0.01860	0.5294
Obese	0.03154	0.01762	0.0736
Maternal hypertension during pregnancy	-0.00294	0.01909	0.8777	0.00664	0.01841	0.7182
Preeclampsia	0.00653	0.01859	0.7256	0.00738	0.01860	0.6917
Birth year	-0.00552	0.00282	0.0507	-0.00538	0.00282	0.0564
Multiple(s)	0.02730	0.01593	0.0867	0.02301	0.01579	0.1452
Gestational age (weeks)	0.01599	0.00569	0.0049*	0.01040	0.00506	0.0401*
Birth weight (gr)	-0.00002	0.00003	0.4994	-0.00004	0.00002	0.0553
Birth length (cm)	-0.00022	0.00337	0.9469	NA	NA	NA
Head circumference (cm)	-0.00915	0.00529	0.0837	NA	NA	NA
TPN	-0.02370	0.02119	0.2634	-0.03083	0.02076	0.1376
Received dextrose	0.03910	0.01818	0.0316*	0.03964	0.01811	0.0287*
Length of birth hospitalization stay (days)	-0.00029	0.00037	0.4378	-0.00023	0.00037	0.5365

Abbreviations: BMI, body mass index; cm, centimeters; gr, grams; SE, standard error; TPN, total parenteral nutrition.

Referent groups: White maternal race, normal maternal first trimester BMI, no hypertension, no preeclampsia, singleton, no TPN, no dextrose.

*p<0.05. P-values were calculated using multivariable linear regression.