Table 2 Characteristics of mothers and infants and interpretation of serology for Coxiella burnetii
Characteristic | IgG I and IgG II ≥1:64 (n= 12) | IgM II and IgG II ≥1:64 or IgM II ≥1:64 (n= 37) | No antibodies present (n= 1125) | χ2 test1 | |||
|---|---|---|---|---|---|---|---|
| Â | n | (%) | n | (%) | n | (%) | P-value |
Mothers | Â | Â | Â | Â | Â | Â | Â |
Parity | |||||||
Primiparae | 4 | (33.3%) | 19 | (51.3%) | 545 | (48.4%) | Â |
Multiparae | 8 | (66.7%) | 18 | (48.7%) | 580 | (51.6%) | 0.836 |
Ethnicity | |||||||
Dutch | 8 | (66.7%) | 31 | (83.8%) | 1021 | (91.2%) | Â |
Other | 4 | (33.3%) | 6 | (16.2%) | 99 | (8.8%) | 0.006 |
Missing | 0 | Â | 0 | Â | 5 | Â | Â |
Socio-economic status | |||||||
Very high | 0 | (0%) | 4 | (10.8%) | 134 | (12.0%) | Â |
High | 1 | (8.3%) | 8 | (21.6%) | 171 | (15.3%) | Â |
Average | 7 | (58.3%) | 17 | (46.0%) | 546 | (48.7%) | Â |
Low | 3 | (25.0%) | 7 | (18.9%) | 199 | (17.8%) | Â |
Very low | 1 | (8.3%) | 1 | (2.7%) | 71 | (6.3%) | 0.838 |
Missing | 0 | Â | 0 | Â | 4 | Â | Â |
Urbanization (addresses per km 2 ) | |||||||
>1500 | 1 | (8.3%) | 6 | (16.2%) | 232 | (20.7%) | Â |
500-1500 | 6 | (50.0%) | 16 | (43.2%) | 481 | (42.9%) | Â |
<500 | 5 | (41.7%) | 15 | (40.5%) | 408 | (36.4%) | 0.538 |
Missing | 0 | Â | 0 | Â | 4 | Â | Â |
Infants | Â | Â | Â | Â | Â | Â | Â |
Gender | Â | Â | Â | Â | Â | Â | Â |
Male | 6 | (50.0%) | 21 | (56.8%) | 553 | (50.3%) | Â |
Female | 6 | (50.0%) | 16 | (43.2%) | 547 | (49.7%) | 0.508 |
Missing | 0 | Â | 0 | Â | 25 | Â | Â |
Position | Â | Â | Â | Â | Â | Â | Â |
Vertex | 12 | (100%) | 31 | (83.8%) | 1024 | (93.4%) | Â |
Breech or other | 0 | (0%) | 6 | (16.2%) | 73 | (6.6%) | 0.131 |
Missing | 0 | Â | 0 | Â | 28 | Â | Â |
Plurality | Â | Â | Â | Â | Â | Â | Â |
Singletons | 12 | (100%) | 36 | (97.3%) | 1076 | (95.6%) | Â |
Multiples | 0 | (0%) | 1 | (2.7%) | 49 | (4.4%) | 0.432 |