Evaluating the Agreement of Risk Categorization for Fetal Down Syndrome Screening between Ultrasound-Based Gestational Age and Menstrual-Based Gestational Age by Maternal Serum Markers

Table 1

Demographic data.

	Mean  SD	Range
Maternal age (year)
1st trimester screening	29.05 ± 5.6
2nd trimester screening	29.3 ± 5.7
Total	29.2 ± 5.6	13.7–45.8
Maternal weight (kilograms)
1st trimester screening	54.9 ± 10.0
2nd trimester screening	56.1 ± 1.0
Total	55.5 ± 10.1	30.5–138.0
Gestational age (days)
1st trimester screening
LMP dating	87.2 ± 6.3	70–97
US dating	87.1 ± 5.3	70–98
2nd trimester screening
LMP dating	112.9 ± 9.2	98–146
US dating	111.5 ± 7.2	98–142

LMP, last menstrual period; US, ultrasound.