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Table 1 The incidence rate of seroconversion to C. burnetii before and after the breeding age.

From: A longitudinal study of serological responses to Coxiella burnetii and shedding at kidding among intensively-managed goats supports early use of vaccines

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)
  1. 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
  2. CI confidence interval