Table 2.

Summary statistics for fetal parameters by gestational age and group (control/intervention)

			Control					Intervention
Gestational age (weeks)	BPD	HC	FL	AC	U-EFW	BPD	HC	FL	AC	U-EFW
13 weeks
Mean	2.9	10.7	1.6	8.9	120.9	3.0	11.0	1.7	9.1	125.4
SD	0.7	2.6	0.6	2.3	48.5	0.7	2.5	0.6	2.3	60.2
n	108	103	103	104	97	104	100	99	100	95
20 weeks
Mean	4.8	17.6	3.3	15.2	357.9	4.7	17.4	3.3	15.1	340.4
SD	0.4	1.3	0.3	1.4	97.6	0.3	1.0	0.3	1.1	57.4
n	154	154	154	154	150	147	147	147	147	147
26 weeks
Mean	6.5	24.0	4.9	21.6	911.2	6.5	23.8	4.8	21.5	887.3
SD	0.3	1.1	0.2	1.2	135.4	0.3	1.1	0.3	1.3	120.0
n	145	145	145	145	143	148	148	148	148	145
30 weeks
Mean	7.6	27.7	5.8	25.9	1525.0	7.5	27.7	5.8	25.9	1529.2
SD	0.3	0.9	0.3	1.2	203.5	0.4	1.2	0.3	1.5	223.5
n	145	145	145	145	144	149	149	149	149	148
34 weeks
Mean	8.4	30.5	6.6	29.8	2295.6	8.4	30.5	6.6	29.9	2315.1
SD	0.3	1.0	0.3	1.6	277.0	0.4	1.2	0.3	1.5	288.2
n	140	140	139	140	140	150	150	150	150	148
38 weeks
Mean	8.9	32.4	7.3	33.1	3061.7	8.9	32.4	7.2	33.1	3042.7
SD	0.4	1.1	0.3	1.6	324.3	0.4	1.2	0.3	1.9	374.2
n	113	113	113	113	112	120	120	120	120	116

n number; SD standard deviation; BPD biparietal diameter; HC head circumference; FL fetal length; AC abdominal circumference; U-EFW ultrasound-estimated fetal weight