Table 1.

Demographic information of the infant cohort. (GA: gestational age, PA: postmenstrual age. The range in the bracket denotes the age range of each group. All the ages are measured in ‘weeks’.)

	All	Male	Female
Subjects	595	308	287
GA at birth	37.2 ± 2.8 (28.6 – 42.1)	37.4 ± 2.8 (28.9 – 41.7)	37.1 ± 2.7 (28.6 – 42.1)
PA at scan	41.6 ± 1.8 (36.7 – 46.5)	41.8 ± 1.9 (36.7 – 46.4)	41.4 ± 1.7 (37.4 – 46.5)
Singleton - Term-born	230	109	121
GA at birth	39.6 ± 1.1 (37.0 – 42.1)	39.6 ± 1.0 (37.0 – 41.7)	39.6 ± 1.2 (37.0 – 42.1)
PA at scan	42.6 ± 1.4 (38.9 – 46.1)	42.5 ± 1.3 (38.9 – 46.1)	42.6 ± 1.5 (39.1 – 45.7)
Singleton - Premature	13	10	3
GA at birth	35.8 ± 0.6 (34.4 – 36.4)	35.7 ± 0.7 (34.4 – 36.3)	36.0 ± 0.4 (35.6 – 36.4)
PA at scan	40.2 ± 1.8 (37.9 – 44.4)	39.8 ± 1.4 (37.9 – 42.3)	41.7 ± 2.4 (40.3 – 44.4)
Twin - Term-born	137	72	65
GA at birth	37.8 ± 0.5 (37.0 – 39.9)	37.6 ± 0.5 (37.0 – 39.9)	37.9 ± 0.6 (37.0 – 39.0)
PA at scan	41.8 ± 1.9 (38.6 – 46.5)	41.3 ± 1.6 (38.6 – 46.4)	42.3 ± 2.1 (39.2 – 46.5)
Twin - Premature	215	117	98
GA at birth	34.4 ± 2.2 (28.6 – 36.9)	34.5 ± 2.3 (28.9 – 36.9)	34.2 ± 2.2 (28.6 – 36.9)
PA at scan	40.6 ± 1.5 (36.7 – 44.9)	40.7 ± 1.6 (36.7 – 44.9)	40.5 ± 1.4 (37.4 – 44.1)