A modified Michaelis-Menten equation estimates growth from birth to 3 years in healthy babies in the USA

Table 3 RMSE values for predicted weights and for predicted heights: Mean, median, IQR, and range for STARR predicted data

Model fit timepoints, RMSE timepoints	Mean	sd	Median	IQR	Range
WEIGHT (kg)
*Boys*
Y1-3, Y1-3	0.347	0.132	0.333	0.168	0.083–1.57
Y1-3, Y3	0.371	0.194	0.345	0.241	0.026–2.38
Y1-2, Y3	1.13	0.613	1.05	0.827	0.051–4.57
Y1-3, Y2-3	0.352	0.150	0.333	0.177	0.073–1.91
Y1, Y2-3	1.37	0.765	1.25	0.976	0.107–6.89
*Girls*
Y1-3, Y1-3	0.312	0.123	0.296	0.160	0.058–1.08
Y1-3, Y3	0.340	0.182	0.313	0.225	0.025–1.79
Y1-2, Y3	1.08	0.187	1.03	0.840	0.046–4.17
Y1-3, Y2-3	0.319	0.623	0.298	0.168	0.045–1.45
Y1, Y2-3	1.34	0.810	1.19	1.04	0.131–6.63
HEIGHT (cm)
*Boys*
Y1-3, Y1-3	1.16	0.342	1.14	0.455	0.259–3.58
Y1-3, Y3	1.12	0.533	1.05	0.690	0.068–5.42
Y1-2, Y3	3.16	1.71	2.91	2.52	0.222–9.61
Y1-3, Y2-3	1.13	0.394	1.09	0.506	0.155–3.87
Y1, Y2-3	5.57	2.82	5.38	4.28	0.518–21.2
*Girls*
Y1-3, Y1-3	1.11	0.315	1.08	0.429	0.326–2.42
Y1-3, Y3	1.06	0.494	0.991	0.647	0.085–3.12
Y1-2, Y3	2.94	1.64	2.68	2.22	0.133–11.8
Y1-3, Y2-3	1.07	0.360	1.04	0.456	0.187–2.42
Y1, Y2-3	5.76	2.99	5.64	4.56	0.447–21.0

The RMSE for model fitted to all years of data, as well as the RMSE calculated for the time window subsets are shown (i.e. the model is fit to the full data, but the RMSE is only calculated with the predicted values versus true values for Y2-3 or Y3)
IQR Interquartile range, RMSE Root mean squared error, sd Standard deviation

ISSN: 1471-2288