. Author manuscript; available in PMC: 2023 Apr 1.

Published in final edited form as: J Pediatr. 2021 Dec 28;243:130–134.e2. doi: 10.1016/j.jpeds.2021.12.058

Table 3.

Final multivariable analysis model in the development dataset and optimism adjusted β coefficients

	Developed model: coefficients (95% CI)	Final model coefficients after adjusting for overfitting^*
Infant weight (kg)/10³	4.11 (3.82 to 4.41)	4.10
Infant weight (kg)/10³ x ln(Infant weight (kg)/10)	−6.90 (−7.85 to −5.96)	−6.88
Infant length (cm)/100³	−3.60 (−4.53 to −2.68)	−3.59
Infant length (cm)/100³ x ln(infant length (cm)/100³)	−14.76 (−20.94 to −8.58)	−14.70
Infant age/100 (days)³	−0.04 (−0.05 to −0.03)	−0.04
Infant age (days)/100³ x ln(age (days)/100)	0.02 (0.01 to 0.03)	0.02
Infant sex
Female	Reference
Male	−0.19 (−0.24 to −0.14)	−0.19
Constant	−0.62 (−1.15 to −0.09)	−0.62

Uniform shrinkage factor from cross-validation determined to be 0.996.