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Table 3 Multivariable linear regression model for herd-level exposure to Ostertagia ostertagi

From: Herd-level seroprevalence of Fasciola hepatica and Ostertagia ostertagi infection in dairy cattle population in the central and northeastern Poland

Risk factor Regression coefficient (B) and standard error (SE) 95% confidence interval (95% CI) for regression coefficient t-statistics p-value
Intercept 0.42 (0.02)
Length of grazing period (months) 0.05 (0.01) 0.03, 0.06 8.40 < 0.001 b
Grazing grass > 50% of all roughage 0.08 (0.03) 0.02, 0.13 2.60 0.010 b
The north-eastern province 0.06 (0.03) 0.01, 0.11 2.24 0.026b
Grazing on pasture −0.16 (0.08) −0.31, − 0.01 −1.98 0.048a
Hay or haylage as main roughage −0.02 (0.03) −0.07, 0.04 − 0.50 0.620
Herd size 0.01 (0.01) −0.01, 0.01 −0.11 0.912
  1. a excluded for very strong correlation with the length of grazing period.
  2. b significant risk factor for herd-level exposure to Ostertagia ostertagi at a significance level of 0.05.