Table 1 Head circumferences (cm) at birth, discharge from hospital, and 4 and 15 years of age, by sex.

	OFCB	OFCD	OFC4	OFC15
Male	27.8 (1.9)	33.3 (1.2)	50.6 (1.8)	55.1 (2.1)
Female	27.2 (2.0)	32.5 (1.1)	49.6 (1.7)	54.4 (1.6)

Values are mean (SD).

OFCB, Occipitofrontal circumference at birth; OFCD, OFC at discharge; OFC4, OFC at 4 years of age; OFC15, OFC at 15 years of age.