Table 2. Linear Regression Models on the NG length.

Model	Predictors	β	SE	Std β	95% C.I. for β			P-value		Adj R2
1	(Constant)	145.879	83.559		−25.283	-	317.041	0.092		0.459
	Height (cm)	2.597	0.513	0.691	1.546	-	3.648	<0.001
2	(Constant)	363.611	81.627		196.405	-	530.816	<0.001		0.155
	NEX length (mm)	0.401	0.159	0.429	0.074	-	0.727		0.018
3	(Constant)	326.933	66.006		191.726	-	462.140		<0.001		0.300
	GX length (mm)	0.599	0.163	0.570	0.264	-	0.933		0.001
4	(Constant)	409.114	79.583		246.095	-	572.132		<0.001		0.094
	GU length (mm)	0.285	0.142	0.355	−0.006	-	0.576		0.055

NG: nasogastric; NEX: Nose-Ear-Xiphoid; GX: Glabella-Xiphoid; GU: Glabella-Umbilicus; β: regression coefficient; Std β: standardized regression coefficient; Adj R²: adjusted R².