TABLE 4.

Body length and head circumference gains between study days 1 and 21, by infant sex and by birth weight category

	Unadjusted length gain, cm/wk*					Unadjusted head circumference gain, cm/wk*
	nHMF		cHMF			nHMF		cHMF
	n	Mean ± SD	n	Mean ± SD	P†	n	Mean ± SD	n	Mean ± SD	P†
Overall	55	1.23 ± 0.62	65	1.18 ± 0.49	0.842	57	1.04 ± 0.32	65	0.96 ± 0.26	0.126
Boys	27	1.40 ± 0.65	28	1.18 ± 0.49	0.364	28	1.12 ± 0.28	28	0.99 ± 0.22	0.062
Girls	28	1.08 ± 0.56	37	1.17 ± 0.50	0.510	29	0.97 ± 0.35	37	0.93 ± 0.29	0.598
<1000 g	19	1.07 ± 0.52	21	1.27 ± 0.52	0.563	19	1.04 ± 0.34	21	0.94 ± 0.28	0.223
≥1000 g	36	1.32 ± 0.66	44	1.13 ± 0.48	0.499	38	1.05 ± 0.32	44	0.96 ± 0.26	0.270

cHMF = control human milk fortifier; nHMF = new human milk fortifier.

^*Data are presented as unadjusted mean ± SD.

^†Superiority P value for gain differences adjusted for postmenstrual age and the relevant anthropometric measure at D1, sex, and center by analysis of covariance.