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Table 3 Pregnancy outcome by presence or absence of antibodies against Coxiella burnetii

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

Outcome 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
Perinatal mortality
No 12 (100%) 37 (100%) 1101 (97.9%)  
Yes 0 (0%) 0 (0%) 24 (2.1%) 0.151
Apgar score
<7 0 (0%) 1 (2.7%) 22 (2.0%)  
≥7 12 (100%) 36 (97.3%) 1079 (98.0%) 0.983
Missing 0   0   24   
Birth weight
<2500 g 2 (16.7%) 3 (8.1%) 86 (7.8%)  
≥2500 g 10 (83.3%) 34 (91.9%) 1015 (92.2%) 0.544
Missing 0   0   24   
Birth weight by gestational age (<p10)
No 9 (75.0%) 35 (94.6%) 969 (89.0%)  
Yes 3 (25.0%) 2 (5.4%) 120 (11.0%) 0.858
Missing 0   0   36   
Congenital malformations
No 12 (100%) 37 (100%) 1105 (98.2%)  
Yes 0 (0%) 0 (0%) 20 (1.8%) 0.346
Gestational age
<37 weeks 1 (8.3%) 2 (5.4%) 109 (10.0%)  
≥37 weeks 11 (91.7%) 35 (94.6%) 987 (90.1%) 0.378
Missing 0   0   29   
Any adverse outcome 2
No 8 (66.7%) 32 (86.5%) 854 (75.9%)  
Yes 4 (33.3%) 5 (13.5%) 271 (24.1%) 0.358
  1. 1Test for differences between antibodies present (columns 2 and 3) and absent (column 4)
  2. 2Any adverse outcome: perinatal death, birth weight <2500 g, birth weight by gestational age <p10, Apgar score <7, or gestational age <37 weeks.