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

BMC Infectious Diseases

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)	Mean difference in gram*: 204 g	168 g (95% CI:70–267 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)	Mean difference in gram*: 160 g	134 g (95% CI: 47–221 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)