Table 1 Population characteristics
Characteristics | Genotyping n = 515 | Controls n = 335 | Total population n = 850 |
|---|---|---|---|
Age (mean ± sd in years) | 30 ± 5 | 31 ± 5 | 31 ± 5 |
Gestational age at inclusion (mean ± sd in weeks) | 19 ± 4 | 28 ± 9 | 23 ± 8 |
Type of pregnancy at inclusion | |||
Singleton | 499 (97%) | 325 (97%) | 824 (97%) |
Twins | 16 (3%) | 10 (3%) | 26 (3%) |
Amniocentesis genotyping result | 17 (3%) | 2 (1%) | 19 (2%) |
Outcome of pregnancy | |||
Delivery | 512 (99%) | 331 (98%) | 843 (99%) |
in utero foetal death | 3 (< 1%) | 1 (< 1%) | 4 (< 1%) |
Missing information | 0 (0%) | 3 (1%) | 3 (< 1%) |
Newborn phenotype | |||
RHD positive | 368 (71%) | 212 (63%) | 580 (68%) |
RHD negative | 136 (26%) | 100 (30%) | 236 (28%) |
Undetermined or missing data | 11 (2%) | 23 (7%) | 34 (4%) |
Father phenotype | |||
RHD positive | 376 (73%) | 126 (38%) | 502 (59%) |
RHD negative | 19 (4%) | 19 (6%) | 38 (4%) |
Undetermined or missing data | 120 (23%) | 190 (57%) | 310 (36%) |
Type of delivery N (%) | |||
Vaginal | 395 (77%) | 264 (79%) | 659 (77%) |
Caesarean section during labour | 62 (12%) | 37 (11%) | 99 (12%) |
Elective caesarean section | 56 (11%) | 34 (10%) | 90 (11%) |
Missing information | 2 (< 1%) | 0 (0%) | 2 (< 1%) |