Table 1.
Baseline characteristics.
| Variable | Intervention (n = 331) | Comparison (n = 315) | P |
|---|---|---|---|
| Age (years) | 33 (30–36) | 34 (32–37) | < 0.01 |
| Parity | |||
| Pluriparous | 266 (80) | 270 (86) | 0.07 |
| Risk factors | |||
| Contact with children < 36 months | |||
| Own child | 251 (76) | 261 (83) | 0.02 |
| Familiar or other childrena | 88 (27) | 53 (17) | < 0.01 |
| Occupationb | 33 (10) | 12 (4) | < 0.01 |
| Age < 20 yrs | 2 (1) | 0 | 0.49 |
| Education | 0.59 | ||
| Primary | 25 (8) | 21 (7) | |
| Secondary | 130 (39) | 134 (42) | |
| Tertiary | 176 (53) | 160 (51) | |
| Duration of the study (days)c | 194 (186–200) | 194 (188–201) | 0.30 |
Data are median (interquartile range) or n (%).
a
Family members other than own child or other children but outside of a child-related professional activity.
b
Health professionals or child care providers.
c
Duration of the study was calculated by subtracting the time of gestation (in days) at fetal aneuploidy test from the time of gestation at delivery or last control.