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Table 4 The number of animals by sex, species and age recruited for the longitudinal study and their respective estimates of animal time at risk (months), number of observed cases and Brucella infection incidence rate

From: Incidence of Brucella infection in various livestock species raised under the pastoral production system in Isiolo County, Kenya

Variable Levels n Animal-time Cases Incidence rate
      Estimate 95% Confidence interval
Sex Male 8 61.60 1 0.016 0.0004–0.091
  Female 71 549.40 11 0.020 0.009–0.036
Species Cattle 31 214.03 6 0.028 0.010–0.061
  Camels 30 151.00 8 0.053 0.022–0.104
  Goats 32 237.40 3 0.013 0.003–0.036
  Sheep 22 161.00 1 0.006 0.0002–0.034
Age Young 11 74.30 2 0.026 0.003–0.097
  Adult 62 536.7 10 0.019 0.009–0.034