Table 3. Effect of baseline total body fat on Ranke’s Prediction model for the first-year height response in SGA children.

	Models	B	95% CI	P value	Partial Correlation	Collinearity (Tolerance)	R2	P value (R2 change)
1	Constant	13.7	11.5, 15.8	<0.0001
	Age (year)	-0.31	-0.54, -0.09	0.008	-0.30	0.97
	Midparental height (SDS)	0.46	0.07, 0.85	0.022	0.26	0.96
	Weight at baseline (SDS)	0.12	-0.26, 0.50	0.52	0.07	0.93	0.15	0.008
2	Constant	13.04	11.1, 15.0	<0.0001
	Age (year)	-0.29	-0.50, -0.08	0.008	-0.31	0.97
	Midparental height (SDS)	0.47	0.11, 0.84	0.012	0.29	0.96
	Weight at baseline (SDS)	-0.04	-0.40, 0.33	0.84	-0.02	0.88
	Baseline total body fat % (z-score)*	0.61	0.28, 0.95	<0.0001	0.39	0.94	0.27	0.001
3	Constant	10.9	8.36, 13.5	<0.0001
	Age (year)	-0.19	-0.41, 0.03	0.096	-0.19	0.85
	Midparental height (SDS)	0.45	0.10, 0.79	0.012	0.28	0.95
	Weight at baseline (SDS)	-0.13	-0.49, 0.23	0.48	-0.08	0.83
	Baseline total body fat % (z-score)*	0.59	0.26, 0.92	0.001	0.38	0.91
	Delta IGF-1 SDS (0 to 1-yr)	0.30	0.07, 0.54	0.013	0.28	0.82	0.33	0.013

^*within cohort z-scores for total body fat percentage at baseline adjusted for age, gender and type of scanner (z-score_c) Dependent Variable: Height velocity (cm/year); B, unstandardized coefficient; CI, confidence interval

Model 1: Ranke’s Model for prediction of first-year height velocity in SGA children; Growth Hormone dose is not included in the model as a fixed dose was used in the study

Model 2: The effect of total body fat percentage on Ranke’s Prediction Model

Model 3: Effect of the addition of change in IGF-I SDS (0 to 1-year)