Table 2:

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. The sample size is denoted by N.

BW	HC	N	Risk	Lower	Upper
Females
Normal	Normal	63,523	0.11	0.11	0.11
Normal	< 10th	2,616	1.67	1.54	1.82
< 10th	Normal	3,155	1.82	1.69	1.96
< 10th	< 10th	4,145	2.57	2.44	2.71
Males
Normal	Normal	71,070	0.14	0.13	0.14
Normal	< 10th	3,079	1.41	1.31	1.52
< 10th	Normal	3,606	1.81	1.70	1.92
< 10th	< 10th	4,552	2.43	2.32	2.54