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Table 1: 
Descriptive statistics of the study population
Statistics
Maternal age at birth (median) (IQR) (yr)34 (29.8–36.0)
Fetal sex
    Male (No.) (%)34 (48.6%)
    Female (No.) (%)36 (51.4%)
Abnormal triple test findings (No.) (%)3 (4.3%)
Abnormal nuchal translucency findings (No.) (%)3 (4.3%)
Karyotype (No.) (%)
    Not performed31 (44.3%)
    Normal findings39 (55.7%)
    Abnormal findings0 (0%)
Chromosomal microarray (No.) (%)
    Not performed48 (68.6%)
    Normal findings21 (30%)
    Abnormal findings1 (1.4%)
Length of pregnancy (mean) (SD) (wk)38.8 (1.3)