Table 1.

Demographic information of infants included in this study

Group	Gestational age (weeks)	Scan age (weeks)	Gender (M/F)	Head circumference at birth (cm)	Birth weight (kg)	Singleton/twinsa
32 weeks	30.36 ± 1.74	32.61 ± 0.32	1/3	27.25 ± 0.50	1.27 ± 0.11	4/0
33 weeks	30.43 ± 2.16	33.39 ± 0.14	3/1	28.65 ± 0.85	1.28 ± 0.18	3/1
34 weeks	32.82 ± 1.31	34.55 ± 0.36	5/2	30.21 ± 0.27	2.14 ± 0.79	5/2
35 weeks	34.36 ± 1.15	35.48 ± 0.27	5/6	31.13 ± 1.08	2.08 ± 0.31	3/8
36 weeks	35.88 ± 0.46	36.59 ± 0.25	4/2	32.12 ± 0.81	2.39 ± 0.16	2/4
37 weeks	37.05 ± 0.28	37.46 ± 0.33	6/3	33.50 ± 0.94	2.73 ± 0.23	6/3
38 weeks	37.93 ± 0.50	38.42 ± 0.31	10/4	33.61 ± 0.92	2.88 ± 0.38	8/6
39 weeks	39.01 ± 0.49	39.43 ± 0.26	10/10	34.22 ± 0.81	3.15 ± 0.36	20/0
40 weeks	40.12 ± 0.39	40.56 ± 0.21	9/9	34.72 ± 0.69	3.33 ± 0.32	18/0
41 weeks	40.58 ± 0.85	41.41 ± 0.29	12/9	35.18 ± 0.80	3.41 ± 0.43	21/0
42 weeks	40.97 ± 0.80	42.23 ± 0.25	4/6	34.87 ± 0.89	3.49 ± 0.19	10/0
43 weeks	40.86 ± 0.57	43.53 ± 0.27	5/9	36.37 ± 0.49	3.46 ± 0.29	14/0
44 weeks	40.60 ± 0.40	44.36 ± 0.22	3/3	36.90 ± 1.06	3.30 ± 0.31	6/0

M, Male; F, female.

^aOnly one of the twins were used.