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Table 1 Statistical models used to study associations between outcome variables and herd antibody status

From: The relationship between antibody status to bovine corona virus and bovine respiratory syncytial virus and disease incidence, reproduction and herd characteristics in dairy herds

Outcome variable

Data type

Model type

Explanatory variables 1

Milk yield

Continuous

Linear

a, b, n

BTMSCC2

Continuous

Linear

a, b, n, p

Calving interval

Continuous

Linear

a, b, n, p, i

Calving to first AI3

Continuous

Linear

a, b, n, p, i

Number of AI3

Continuous

Linear

a, b, n, p, i

Dead calves 0-24 hours

Binomial

Logistic

a, b, n

Culling

Binomial

Logistic

a, b, n, p

UDS4 ≥6

Binomial

Logistic

a, n

  1. 1 a = antibody status, b = breed, n = herd size, p = milk production level, i = artificial insemination strategy
  2. 2 bulk tank milk somatic cell count.
  3. 3 artificial insemination
  4. 4 udder disease score, see main text for explanation.