. Author manuscript; available in PMC: 2022 Oct 18.

Published in final edited form as: J Pediatr. 2018 Jul 13;201:27–33.e4. doi: 10.1016/j.jpeds.2018.06.004

Table II.

Unadjusted and adjusted^* longitudinal mixed models for the association between absolute birth weight group and percentage breast milk (n = 1799) and daily formula consumption (n = 1265) between birth to 6 months

	Model 1 ß (95% CI)		Model 2^* ß (95% CI)		Model 3^* ß (95% CI)
Variable	Percentage breast milk	Daily formula consumption	Percentage breast milk	Daily formula consumption	Percentage breast milk	Daily formula consumption
HBW	3.27 (−3.11, 9.64)	−1.36 (−4.26, 1.54)	4.57 (−1.89, 11.04)	−2.06 (−4.99, 0.86)	5.03 (−1.46, 11.53)	−1.99 (−5.03, 1.04)
Age	−0.94 (−1.02, −0.86)^†	0.42 (0.37, 0.47)^†	−0.94 (−1.02, −0.86)^†	0.42 (0.37, 0.47)^†	−1.14 (−1.27, −1.01)^†	0.90 (0.79, 1.01)^†
HBW × age	0.28 (.04, 0.52)^†	.05 (−0.10, 0.19)	0.28 (.04, 0.51)^‡	.04 (−0.10, 0.19)	.07 (−0.30, 0.44)	0.11 (−0.22, 0.43)
Age²					.01 (.00, .01)^†	−.02 (−.03, −.02)^†
HBW × age²					.01 (−.00, .02)	−.00 (−.02, .01)
Model Fit Statistics
Deviance	87 930	44 286	87 870	44 230	87 844	44 130
AIC	87 947	44 302	87 902	44 262	87 881	44 167
BIC	88 005	44 355	88 017	44 369	88 011	44 287

AIC, Akaike’s information criterion; BIC, Bayesian information criterion.

Models are adjusted for mother’s age, prepregnancy BMI, gestational age, infant sex, race/ethnicity, and PIR.

^†

P < .001.

^‡

P <.05.