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Table 1 Population characteristics

From: Effectiveness and costs of non-invasive foetal RHD genotyping in rhesus-D negative mothers: a French multicentric two-arm study of 850 women

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%)