Table 1.

The incidence rate of seroconversion to C. burnetii before and after the breeding age.

Time period (weeks)	Number at risk	Goat weeks at risk	Number of seroconversions	Incidence rate (per 100 goat weeks at risk)	Incidence rate ratio (95% CI)
0–10	95	618.5	40	6.5 (4.6, 8.8)	1.00 (reference)
11–28	32	238.0	18	7.6 (4.5, 12.0)	1.17 (0.67, 2.04)
29–71	8	61.5	8	13.0 (5.6, 25.6)	2.01 (0.94, 4.30)
Total	135	918.0	64	7.0 (5.7, 8.9)	–

10 weeks is the target weaning age, 28 weeks was the target breeding age in the intensively-managed goats on the study farm in Victoria, Australia, 2014–2015

CI confidence interval