Obstetrics and Gynecology International / 2018 / Article / Tab 2

Research Article

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 2

The number of different days between LMP-based GA and US-based GA in gestational age estimation.

Mean different daysFirst trimesterSecond trimesterTotal
N%N%N%

03769.33187.96948.6
1–3183745.3160039.8343742.6
4–7130232.1119429.7249630.9
8–1445111.161515.3106613.2
15–21501.21634.12132.6
22–28180.4701.7881.1
>28210.5561.4771.0
Total4055100.04016100.08071100.0

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