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Table 3 Birth weight parameters for Danish pregnant women according to antibodies against C.burnetii , immunofluorescence antibody test (IFA)

From: No excess risk of adverse pregnancy outcomes among women with serological markers of previous infection with Coxiella burnetii: evidence from the Danish National Birth Cohort

  IFA positive for C. burnetii antibodies IFA negative for C. burnetii antibodies Measures of association
    Crude Adjusted
Birth weight all (n = 842) Median Birth weight (interquartile range) 166 676 Mean difference in gram*: 204 g 168 g (95% CI:70–267 g)**
3780 g (3480 g; 4085 g) 3600 g (3260 g; 3997 g)
Birth weight children born at term (n = 803***) Median Birth weight (interquartile range) 163 640 Mean difference in gram*: 160 g 134 g (95% CI: 47–221 g)**
3790 g (3490 g; 4090 g) 3650 g (3309 g; 4000 g)
Small for gestational age term pregnancies (week 37+ (n = 82) Median Birth weight (interquartile range) 9 73 OR: 0.5 0.4 (95% CI: 0.8–1.0)**
  2820 g (2275 g; 3010 g) 2850 g (2350 g; 3030 g)   
  1. *IFA positive babies are heavier **adjusted for smoking, age and gravidity.
  2. *** of which 163 were seropositive and 640 seronegative.