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Table 4 Two logistic regression models for shedding of IAV in individual pigs over time in Study 1

From: Longitudinal study of influenza A virus circulation in a nursery swine barn

Variable Coefficient (95% CI) p value
Model 1
 Time (days) 0.37 (0.28, 0.45) <0.01
 Time (days)2 a −0.01 (−0.006, −0.004) <0.01
 H3N2_Bb −0.31 (−0.59, −0.02) 0.03
 H3N2_B2 a,b 0.08 (0.01, 0.14) 0.01
Model 2
 Time (days) 0.37 (0.28, 0.45) <0.01
 Time (days)2 a −0.01 (−0.006, −0.004) <0.01
 Source sow herdc <0.01\\
 Source 1 1.46 (0.78, 2.13) 0.01
 Source 2 0.36 (-0.38, 1.1) 0.34
 Source 3 1.09 (0.41, 1.77) 0.01
 Source 4 Baseline
 Source 5 0.87 (0.16, 1.59) 0.01
  1. Model 1 depicts association of viral shedding with maternally derived antibodies for (f A/SW/ON/104-25/12/H3N2 (H3N2_B). Logistic regression with pig as a random effect on intercept was used. The Model 2 details association with the source herd.
  2. \\p-value obtained by testing categorical variable using a partial likelihood test.
  3. aQuadratic effect of the variable.
  4. bThe original titer divided by 10 and then log2 transformed.
  5. cCoefficients are adjusted for the linear and quadratic effect of time.