Table 4:

The gestational-age-adjusted mortality risk and 95% confidence interval for infants born preterm (22 to 29 weeks) with normal birthweight (BW) and head circumference (HC) are shown in bold font. The other rows show the mortality relative risk (as compared to infants with normal BW and HC) and 95% confidence interval for infants with either one or both anthropometric measurements below the univariate 10th percentile. Estimates are given by sex, separately for infants whose HC-to-BW ratio in the allometric direction is below the 90th percentile (normal) or above it (supranormal). The sample size is denoted by N.

BW	HC	N	Risk	Lower	Upper	N	Risk	Lower	Upper
Females		Normal HC-to-BW ratio				Supranormal HC-to-BW ratio
Normal	Normal	59,033	0.11	0.11	0.11	4,490	0.13	0.12	0.14
< 10th	Normal	1,425	1.70	1.52	1.90	1,730	1.62	1.44	1.82
< 10th	< 10th	3,284	2.30	2.16	2.45	861	3.14	2.82	3.50
Males		Normal HC-to-BW ratio				Supranormal HC-to-BW ratio
Normal	Normal	65,984	0.14	0.13	0.14	5,086	0.14	0.13	0.15
< 10th	Normal	1,425	1.77	1.61	1.95	2,181	1.81	1.64	2.00
< 10th	< 10th	3,384	2.16	2.04	2.28	1,168	3.17	2.88	3.48