Table 1 Demographic characteristics of the participants in this study cohort
| Â | Cases (trios) | Fetal sex (male:female) | Gestational week (weeks) | Maternal age (years) | Paternal age (years) |
|---|---|---|---|---|---|
Total | 959 | 0.58:0.42 | 23.6 (22.25–26.4) | 28 (26–31) | 32 (29–34) |
 Cardiac | 265 | 0.60:0.40 | 24 (22.6–24.6) | 28 (26–31) | 32 (30–35) |
 Chest and respiratory tract | 43 | 0.49:0.51 | 24.1 (23.15–26.15) | 28 (26–30) | 31 (30–33.5) |
 CNS | 116 | 0.53:0.47 | 26.45 (23.075–31.2) | 28.5 (26–31) | 32 (29–35) |
 Facial | 127 | 0.69:0.31 | 23.2 (22.4–24.35) | 28 (25.5–30) | 31 (29–34) |
 Gastrointestinal tract and AW | 42 | 0.57:0.43 | 24 (14.5–28.125) | 29 (27–30) | 32 (30–34) |
 Genitourinary | 94 | 0.62:0.38 | 24.3 (23–29.45) | 29 (27–31) | 32 (29–34) |
 Hydrops | 31 | 0.58:0.42 | 24.2 (21.5–30.5) | 28 (25–31) | 32 (28–35) |
 Increased NT | 20 | 0.60:0.40 | 13 (12.5–13.3) | 28 (27–30) | 31 (30–34) |
 Skeletal | 94 | 0.53:0.47 | 23.8 (22.15–25.975) | 29 (26–32) | 32 (30–35) |
 Multisystem | 127 | 0.54:0.46 | 22.6 (14.45–24.25) | 28 (25–30) | 31 (29–33) |