Table 3

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

*IFA positive babies are heavier **adjusted for smoking, age and gravidity.

*** of which 163 were seropositive and 640 seronegative.

Nielsen et al.

Nielsen et al. BMC Infectious Diseases 2013 13:87   doi:10.1186/1471-2334-13-87

Open Data