Table 1.
Overview of population characteristics
| Characteristics | Distribution | Data available |
|---|---|---|
| Mean (SD) maternal age (years)* | 30.8 (4.8) | 32 160 (100.0) |
| Ethnicity (No (%)): | 21 536 (67.0) | |
| European* | 19 478 (90.4) | |
| Mediterranean† | 879 (4.1) | |
| Black Creole‡ | 168 (0.8) | |
| Asian§ | 85 (0.4) | |
| Hindustani | 66 (0.3) | |
| Other | 860 (4.0) | |
| Parity (No (%)): | 21 579 (67.1) | |
| Nulliparous | 9712 (45.0) | |
| Multiparous | 11 867 (55.0) | |
| Mean (SD) gestational age at sampling (weeks+days) | 276 (06) | 21 579 (67.1) |
| Median (range) cell-free fetal DNA level (genome equivalents/mL)c | 46.6 (1.5-868.5) | 13 076 (40.7) |
*Not including Mediterranean countries.
†All countries surrounding the Mediterranean Sea.
‡Black Creole includes all black people.
§Asian included all Asian countries, with the exception of people of Hindustani descent.