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Table 2 Characteristics of mothers and infants and interpretation of serology for Coxiella burnetii

From: Antibodies against Coxiella burnetii and pregnancy outcome during the 2007-2008 Q fever outbreaks in the Netherlands

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
  n (%) n (%) n (%) P-value
Mothers        
Parity
Primiparae 4 (33.3%) 19 (51.3%) 545 (48.4%)  
Multiparae 8 (66.7%) 18 (48.7%) 580 (51.6%) 0.836
Ethnicity
Dutch 8 (66.7%) 31 (83.8%) 1021 (91.2%)  
Other 4 (33.3%) 6 (16.2%) 99 (8.8%) 0.006
Missing 0   0   5   
Socio-economic status
Very high 0 (0%) 4 (10.8%) 134 (12.0%)  
High 1 (8.3%) 8 (21.6%) 171 (15.3%)  
Average 7 (58.3%) 17 (46.0%) 546 (48.7%)  
Low 3 (25.0%) 7 (18.9%) 199 (17.8%)  
Very low 1 (8.3%) 1 (2.7%) 71 (6.3%) 0.838
Missing 0   0   4   
Urbanization (addresses per km 2 )
>1500 1 (8.3%) 6 (16.2%) 232 (20.7%)  
500-1500 6 (50.0%) 16 (43.2%) 481 (42.9%)  
<500 5 (41.7%) 15 (40.5%) 408 (36.4%) 0.538
Missing 0   0   4   
Infants        
Gender        
Male 6 (50.0%) 21 (56.8%) 553 (50.3%)  
Female 6 (50.0%) 16 (43.2%) 547 (49.7%) 0.508
Missing 0   0   25   
Position        
Vertex 12 (100%) 31 (83.8%) 1024 (93.4%)  
Breech or other 0 (0%) 6 (16.2%) 73 (6.6%) 0.131
Missing 0   0   28   
Plurality        
Singletons 12 (100%) 36 (97.3%) 1076 (95.6%)  
Multiples 0 (0%) 1 (2.7%) 49 (4.4%) 0.432
  1. 1Test for difference between antibodies present (columns 2 and 3) and absent (column 4)