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Table 3 Multivariable Weibull accelerated failure-time regression model assessing risk factors for seroconversion to C. burnetii before breeding.

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

Variable Levels n Serocon. Coef. SE (Coef.) p value Survival rate ratio (95% CI) Hazard ratio (95% CI)
Cohort Cohort 2 62 42 −0.60 0.11 0.001 0.55 (0.39, 0.78) 2.73 (1.45, 5.16)
Cohort 1 33 16 0.00 (ref)    1.00 1.00
Doe IgM Positive 37 29 −0.42 0.16 0.008 0.65 (0.48, 0.89) 2.04 (1.19, 3.54)
Negative 56 28 0.00 (ref)    1.00 1.00
Intercept 3.89 0.35 < 0.001
  1. In intensively-reared goats in Victoria, Australia, 2014–2015. Interpretation: After adjusting for the effect of cohort, kids born by does that had positive IgM titres (Doe IgM = positive; indicating recent exposure) were 2.04 times more likely to seroconvert within the first 6 months of life compared to those born by IgM seronegative does. Log likelihood = −201.1. Coef. coefficient. Similarly, after adjusting for the effect of farm, kids born by does that had positive IgM titres were 2.23 times (95% CI 1.29, 3.86) more likely to seroconvert within the first 6 months of life compared to those born by IgM seronegative does; see Additional file 3